Sorry this took so long, but in the middle of writing this I actually went to London. It's funny cause I actually wrote this entire chapter with the brightness of my computer at 0 because I didn't want my brother to annoy me about writing this, he makes fun of me, calls me nerdy, but nerd is a pretty relative term.

Chapter 4: Invisible

Northumberland St.

Annabeth POV.

Bright buildings, chatting people and absolutely freezing, perfect night in London (sorry to all you people living in London, I have no idea what it's like at night there, plz don't hate me). After a short taxi ride me and Percy found ourselves walking down a semi-crowded street.

"So what exactly are we doing here?" I asked

"Northumberland St's a five minute walk from here."

"And you think he's stupid enough to go there?"

"No, I think he's brilliant enough. I love the brilliant ones, they're so desperate to get caught." I looked at Percy with confusion and surprise as he smiled devilishly, almost as if he was the killer, which I knew he wasn't.

"Why?"

"Why what else? Appreciation! Applause, at long last a spotlight on their dull, meaningless lives. That's the frailty of genius Annabeth, it needs an audience otherwise its just random crap done by a raving lunatic." Percy's eyes were filled with knowledge as we walked down the sidewalk.

"Right, so what's the point of this entire trip?" I asked and Percy finally noticed he didn't really answer my original question.

"This is his hunting ground, right in the heart of the city. Now that we know all the victims were abducted, that changes everything. All the victims disappeared from busy streets and crowded places, but no one saw them go anywhere. Think! Who do we trust even though we don't know them? Who can pass unnoticed wherever they go? Who is the wolf that hides in sheep's clothing?" I could almost see the electricity coursing through Percy's messy black hair as he struggled to answer his own questions.

"I don't know, who?"

"How the hell should I know? Hungry?" Percy's sudden change of tone scared me as we entered the door of a little restaurant overlooking the street. He talked to the waiter at the front and we got the seats closest to the window.

"I can't tell if you brought me to a stakeout or to a dinner date?" I asked and Percy smirked.

"Both. Keep your eyes on that street, that's where our killer will make an appearance."

"Do you think he'll come?"

"He's killed four people and one of them texted him. I think that's a good enough reason to come." Suddenly a large well-dressed man, most probably the manager of the restaurant, came up to our table and offered us some menus. However, he and Percy seemed to know each other as the manager shook Percy's hand and smiled.

"Percy! Anything you want on the menu, free of charge and for your date as well." Said the man and Percy smiled.

"I'm not his date." I said plainly and he apologized.

"Sorry, got a bit carried away. This man got me off a murder charge, I owe him a bit."

"Annabeth, this is Butch. Two years ago I proved to Di Angelo that in a particularly gruesome triple homicide, Butch was in a different town housebreaking." I "ahh"ed in realization as Percy looked like he was reminiscing that moment.

"This man is a genus, he cleared my name."

"I cleared it a bit. Anything happening outside?" Percy blatantly ignored Butch's comment and shifted his attention to the practically empty street.

"Nothing really."

"If it wasn't for this man I'd be going to prison." Butch seemed truly happy, but Percy seemed bent on ruining that happiness.

"You did go to prison." Butch's smile immediately disappeared, but it came back as he said:

"I'll get a candle for the table. It's more romantic." He left as fast as possible, most probably to try and forget that little piece of info about going to prison.

"You might as well order something, we might be here for a while." As soon as Percy said that, Butch came back and placed a candle on the table, giving Percy a thumbs up before he left. With nothing else to do, I skimmed through the menu and tried to ignore the one thought nagging me on the back of my mind. Finally I couldn't take it anymore and said:

"People don't have archenemies."

"Sorry?"

"In real life. People don't have archenemies in real life. It doesn't happen." Percy looked at me as if I was joking but I was dead serious.

"Doesn't it? Sounds a bit dull don't you think? Life wouldn't be fun if you didn't have an archenemy or two."

"So who did I meet?" I asked with the image of the man coming into my mind.

"What do real people have then, in their…'real lives'?" Percy dodged my question and asked me a completely different one.

"Well, friends would be one of them. People they like, people they don't like. Boyfriends, girlfriends…"

"*Sigh, like I was saying, dull." Percy looked absolutely bored out of his mind while I was trying to figure out what was going on in that jumbled mind of his.

"So you don't have a girlfriend then? Boyfriend?" I asked

"None of the above. You've spent a day with me, so you should already know that relationships aren't my area of expertise."

"Right." I don't know why, but something in my chest felt like it lit up, but it went away as fast as it came.

"So you're like me, unattached." Percy looked at me skeptically before going back to scouring the street but after a while, he looked back at me and said:

"Annabeth, I think you should know… I consider myself married to my work and while I'm flattered, I'm not looking for any…" I immediately tried to steer this conversation as far away from the direction it was going before I turned red again.

"Oh no no no no, I'm not asking you for something like… just no." Percy looked both relieved and offended and I felt slightly bad for reacting so quickly.

"Good. Thank you." That's all Percy said before going back to the street, but his eyes right away narrowed as if he saw something suspicious.

"What?" I asked while chomping on some bread left on the table.

"Taxi, across the street. It's stopped." He replied and as soon as I looked I saw a taxi just sitting across the restaurant with no one getting in or out. "Why a taxi… oh, that's clever."

As Percy was talking I noticed a very shady-looking man peering through the rear windshield and scanning the area around him.

"Why, why is that clever?" I asked, still not quite getting the point Percy was making.

"That's him. In the taxi, that's the killer." My eyes widened and I whipped my head to the shady man who was looking at the sidewalk.

"Stop staring." Ordered Percy but I couldn't take my eyes off our suspected killer.

"But you're staring."

"Well we can't both stare, that'd be odd." Just as he said it, Percy rose up from our table and headed to the front door. In a panic, I immediately grabbed my jacket and bolted after Percy, not even realizing I forgot a little something at our table. However, as soon as I exited the restaurant, my excitement got the better of me and I couldn't help but stare. That was my mistake. The shady man and I locked eyes for a second, then he turned away and the cab started down the street. Percy looked frustrated as he charged after the cab, almost getting hit by a car on the way. I quickly followed suit but the cab turned a corner and we both lost sight of it.

"I've got the cab number." I said but Percy didn't look relieved.

"Good for you." Percy closed his eyes for a second and I looked at him oddly before he speedily shouted: "Right turn, one way, road works, traffic light, bus lanes, pedestrian crossing, left turn only, traffic lights…"

Percy stopped talking for a second as he raised his head to a building and ran. I was hot on his heels as he jumped through the door and ran up the stairs into the roof access. The next thing I knew we were running and jumping across London's rooftops like Batman. Down below, I could see the same taxi from earlier driving along with us but it made a right turn and disappeared. Soon enough Percy led me to a fire escape, then into an alley as we ran to intercept the taxi, only for it to completely pass us by.

"Damn it, this way." Despite missing the taxi, Percy didn't stop running across sidewalks and alleyways, yet the entire time I couldn't help thinking how Percy knew all these places and directions. Eventually though he began to slow down, I thought he was just tired, but I was proved wrong when he jumped in front of our killer's taxi.

"Police! Open her up!" Shouted Percy, banging on the rear door of the taxi. However, one look at the person in the back seat did Percy looked more disappointed than frustrated as he said: "No, he isn't our guy. Teeth, tan… What? Californian? L.A, Santa Monica. Just arrived."

I didn't bother asking how Percy knew that because it'd probably involve a long, complicated explanation that would have nothing to do with catching our murderer. Percy, sensing the very awkward situation of busting open a tourist's cab door changed his expression and said:

"First trip to London right?" The American tourist looked at us skeptically.

"Sorry, are you guys the police?" he asked, his American accent, securing his innocence.

"Yeah, everything alright?" Surprisingly, Percy raised a police badge out of his pocket, but for a split second I thought I saw someone else's name. Our American chuckled nervously before replying:

"Yeah."

"Right then. Welcome to London." Percy saluted the man before slamming the door shut. I was stunned and embarrassed for a minute that I froze up. When I noticed the American staring at me, I smiled and ran away as fast as possible, following Percy to the end of the street.

"So basically that was just a cab that happened to slow down." I said disappointedly.

"Basically." Percy looked frustrated at the cab with our American inside as it pulled up at the curb.

"Wrong country, good alibi."

"As they go." As Percy was internally scolding himself, I saw that he was still holding the police badge from earlier.

"Hey, let me see that." I grabbed the badge from his hand and took a look at the name. "Detective Inspector Di Angelo?"

"Yeah. I pickpocket him when he's annoying. You can keep that one, I've got plenty back at the flat." Replied Percy looking rather bored. All of a sudden, I thought of something and started laughing and Percy looked at me like I was the crazy one. "What?"

"Nothing just… 'Welcome to London.'" I started laughing again and soon enough Percy cracked a little smile. Just then I noticed that the American from a while ago got out of his cab and was not talking to an actual policeman… and pointing at us.

"Got your breath back?" Percy asked

"Ready when you are." With that, we took off as fast as possible to avoid being arrested for impersonating an officer.

XXXXXXXXX

Baker St.

Annabeth POV.

Running from the actual Police was utterly exhausting, but my adrenaline was pumping and my heart racing so I was having some fun. It took about an hour to get back home and loose the cops, but Percy and I managed it. Who knew, that in just one day with Percy Jackson would be so much fun.

"That was ridiculous. That was the most ridiculous thing… I've ever done." I stated as we entered the bottom floor of the flat and rested ourselves on the wall.

"And you invaded Afghanistan." I laughed weakly at the joke, for I had not the strength to even move.

"That wasn't just me. Why aren't we back at the restaurant?" I asked, wondering why we went home instead of the restaurant.

"They can keep an eye out. It was a long shot anyway."

"So what were we doing there?" Percy shook his head a bit before saying:

"Oh, just passing the time. And proving a point."

"What point?"

"You." I was confused for a moment, until Percy said: "Mother, Dr. Chase will be taking the room upstairs."

Percy smiled at me for a moment and I blushed. I'm going to be sharing a flat with a drop-dead gorgeous detective.

"S-Says who?" Even though my inner voice screamed at me to fully take the room, my more rational side still wanted more reasoning.

"Says the man at the door." I was confused for a moment, but then a hard couple of knocks at the door cleared my confusion while Percy was smiling like in accomplishment. I went to the door and opened it to find that Butch was standing outside.

"Percy texted me. He said you forgot this." Butch held up an object, and it took some time to register before it came to me that he was holding up my cane. What also came clear was the fact that the throbbing pain in my leg was gone and that I had no trouble at all traversing and parkouring my way after a taxi-cab through the London streets and alleyways.

"Ah, er… thank you." Butch smiled, and so did I as I went back into the flat, but my grin disappeared as Sally came into the main room, looking utterly distressed and disappointed.

"Percy, what have you done?" she asked, her face and voice wrought with horror.

"Mother?" Asked Percy, looking very confused.

"Upstairs." Percy and I looked at each other and we rushed up the stairs to find an entire fleet of policemen turning over our flat with Detective Inspector di Angelo sitting smugly in Percy's sofa chair.

"What the-?!" I nearly lost my cool as for all I knew, some perverted cop went through my personal items earlier.

"I knew you two would find the case, I'm not stupid."

"You can't just break into my flat." Percy said, outraged.

"You can't withhold evidence – and I didn't break in, this is perfectly legal." Said Di Angelo without fear.

"What do you call this then?" Percy looked pissed.

"Drugs bust." Di Angelo raised his hands and gestured to the multitude of police-people poking around the flat.

"Seriously, this guy, a junkie? Have you met him?" I argued but Percy turned to me to try and stop me talking, but I was on a roll already. "You could search this flat all day and you wouldn't find a single thing that you could call 'recreational'."

"Annabeth, you'd probably want to shut up right about now."

"But come on…" I was about to shut Percy up himself, but as soon as I saw the serious look in his eyes, my own eyes widened as realization struck me. "No."

"What?" Percy's expression melted away and his face went back to normal.

"Are you really…?"

"Shut up! I'm not your sniffer dog." Percy's attention went from me to Di Angelo to prevent further squabbling, and also to avoid talking to me.

"No, Michael is my sniffer dog." As soon as Di Angelo said his name, a certain Michael Yew appeared from the kitchen and waved.

"Michael, what are you doing here on a drugs bust?" asked Percy, very surprised of Michael's presence.

"Oh I volunteered." Michael looked absolutely pleased with himself, as Percy was about to explode.

"They all volunteered. They're not strictly speaking on the drugs squad, but they're very keen." At that moment, Detective Thalia came out from the other side of the kitchen.

"Are these human eyes?" she asked, holding up a glass jar with several differently colored eyes.

"Put those back!" shouted Percy

"But they were in a microwave?" Detective Thalia looked at Percy skeptically and he sighed.

"They were an experiment, put them back!" Detective Thalia rolled her eyes and disappeared behind a shelf.

"Keep looking everyone. Look Jackson, we can continue this and find some 'unsettling' items, or you can help us properly and I'll stand them down." Said Di Angelo, standing up and walking over to us.

"This is childish." Muttered Percy, walking past Di Angelo, however he heard it and said:

"Well I am dealing with a child. Percy this is our case and I am letting you in but do not go off on your own!" Di Angelo scolded Percy and I felt a bit left out and awkward in this conversation as Percy paced around Di Angelo angrily.

"So you set up a pretend drug bust to bully me?" Percy shouted.

"It stops being pretend if we find anything."

"I-AM-CLEAN! I don't even smoke." Percy emphasized, getting right in Di Angelo's face and rolling up his sleeve, showing the nicotine patch on his arm.

"Yeah, neither do I, so let's work together." replied Di Angelo, lifting up his own sleeve to show another nicotine patch. Percy looked frustrated when he pulled down his sleeve and stomped away. "We've found Rachel."

Those three words immediately caught both Percy's attention and mine as well and we looked at Di Angelo hopefully.

"Who is she?" I asked, happy to finally get some words out of my mouth.

"Jennifer Wilson's only daughter." Percy looked confused for a minute, his face looking like he was calculating something.

"Her daughter? Why would she write her daughter's name? Why?" Percy started contemplating but Michael Yew had to break the train of thought.

"Never mind that! According to someone, whoever had the case would be the murderer, and we found it in the hands of our favorite psychopath." Stated Michael, looking triumphant in his own scowling face.

"Not a psychopath, I'm a high-functioning sociopath, get it right. You need to bring Rachel in to question her." Percy said at lightning speed but Di Angelo cut him off.

"She's dead." Percy didn't look fazed as he went into an entirely new array of questions and statements.

"Excellent. How, when and why? Is there a connection, there has to be."

"Well I doubt it since she's been dead for 14 years. Technically she was never even alive." Percy looked confused for a moment before Di Angelo explained it further. "Rachel was Jennifer Wilson's stillborn daughter, 14 years ago."

It seemed as though our most vital lead in the death of Jennifer Wilson went completely down the drain and I looked down in disappointment. However, Percy and his ultra-intuitive mind continued to question the situation.

"Why, why would she do that? What is the significance of Rachel?"

"Why would she think of her daughter in her last moments – yeah, sociopath, I'm seeing it now." Michael's fairly blunt and negative statement didn't rile up Percy instead it intrigued him.

"She didn't think about her daughter, she scratched her name on the floor with her fingernails as she was dying. It took effort, it would've hurt." Percy restarted pacing around the room as his mind kept trying to piece together a mystery that we all didn't understand.

"You said that the victims all took the poison themselves, that he makes them take it. Well maybe, I don't know, talks to them." I said. It was a radical idea, but the fact that the victims take the poison themselves, does give them as much time as possible to take the pill whenever they wanted. "Maybe he used the death of her daughter somehow."

"Bah, but that was ages ago, why would she still be upset?" Percy's inability to comprehend human emotion, especially the one of a would-be-mother, stunned the entire room and all was silent, even Michael and Detective Grace shut up. Percy seemed to notice this and his eyes darted around. "Whoops."

"Yeah, whoops." I replied, but the momentary shock of the situation fluttered away as Percy returned to analyzing the significance of Rachel.

"But if you were dying, if you'd been murdered, what would be the only thing running through your head in your last few seconds?" Percy got up in my face as he was talking.

"Umm, 'I don't want to die'?" I stated, however Percy looked unsatisfied.

"Oh come on, use your imagination!"

"I don't have to." I replied and Percy looked frustrated at me and said:

"Yeah, but if you were clever, really clever. Jennifer Wilson, running all those lovers, she was clever." Percy continued pacing around, trying to think. "She's trying to tell us something."

Without warning, Sally came from downstairs in the middle of all the tension and said:

"Percy, is the doorbell working? Your taxi's here." She said, pointing down the stairs, however Percy brushed her off and continued pacing. "Oh dear, they're making such a mess."

"It's a drugs bust Ms. Sally." I said and Sally looked panicky.

"Oh but they're just for my hip! They're herbal soothers…" Sally started, but a sudden outburst from Percy silenced, not only her, but also everyone.

"SHUT UP EVERYBODY, SHUT UP! DON'T MOVE, DON'T SPEAK, AND DON'T EVEN BREATHE! I'M TRYING TO THINK! Michael, face the other way you're putting me off." Michael looked both insulted and stunned at what Percy said.

"What? My face is putting you off?" he inquired, but Di Angelo told him to shut up and face away and he begrudgingly did.

"Come on think…" mumbled Percy

"But what about your taxi?" asked Sally and I could almost see Percy explode, but sudden realization came to his face and he started… grinning?

"Oh, ah! She was clever clever, yehehes! She's cleverer than you lot and she's dead. Do you see? Don't you get it? She didn't loose her phone; she planted it on him, on the murderer. When she got out of the car, she knew that she was going to die. She left the phone in order to lead us to her killer!" Percy kept smiling as he explained everything, however his smile disappeared as Di Angelo asked:

"But how?"

"What do you mean how? Rachael!" Percy seemed like everything was crystal clear, but to us it was still pretty opaque what the hell he was on about. "Oh, look at you lot, you're all so vacant. Is it nice not being me, it must be so relaxing. Rachael is not a name."

"Then what is it?" I asked, getting annoyed at Percy's pride in his own mind.

"Annabeth, on the luggage there's a label. Email address, tell me." I was reluctant to check, but any lead on the case, as well as what Percy was saying would be worth it. I read out the email as Percy started typing on my computer whilst also rambling to himself:

"She didn't have a laptop, which means she did business on her phone, so it's a smartphone, email enabled. Which means there's a website for her account. The username is her email address and the password is…?" Percy left it to us to find out, and we all did pretty quickly considering the pretty obvious clue staring us in the face.

"Rachel." I said, just as Percy pressed enter.

"So we can read her emails. So what?" asked Michael and Percy scowled.

"Michael, don't talk out loud, you're lowering the IQ of the whole street. We can do much more than read her emails, it's a smartphone, it has GPS. Which means if you loose it you can…?" A blast of understanding hit me as I looked onto my laptop screen where it said: Locating, please wait.

"W-We've done it! We can find the killer!" I celebrated for a moment, but not before the GPS located the phone, which nearly made me faint. "I-Is that?"

"Our flat? How can it be here? How?" Percy looked utterly surprised.

"Percy, this taxi driver!" said Sally, but no one paid her any mind as everyone concentrated on finding the phone.

"Well maybe it was in the case and it fell out somewhere?" said Di Angelo.

"And I didn't notice, me I… didn't… notice…" Percy's speech slowed till he seemed to zone out, and completely block out all external communication.

XXXXXXXXX

Baker St.

Percy POV.

Oh, is it my turn? Already? Bugger I thought I'd have more time. Oh well, where were we? Chasing the taxi… running back home… shouting at Michael… ah, yes, I was zoning out, that's where we were.

Well, to put it simply for your primitive minds, even though I had found Rachel, discovered the phone's meaning, and the location of the killer, there was still that one piece of the puzzle that didn't fit anywhere, even though you turned it around and twisted it about, until the taxi "I" called for.

So dear reader, I ask you: Who passes undetected wherever they go? Who hunts in the middle of a crowd? Who would you trust, even though you never met them? The answer, the common taxi driver, a.k.a the one standing outside my flat door, waiting for me. I saw him, the driver, standing behind my mother, pulling out a bright pink phone from his pocket and tap it. Immediately, my own phone buzzed, signaling a text that said: Come with me, or I kill the blonde.

As soon as I read the text, the driver disappeared into the shadow of the staircase, going outside and waiting for me.

"Percy are you ok?" asked Annabeth, snapping me back to reality.

"What? Yeah… yeah, I'm fine." I was white as a sheet, and my only goal was to get down and out of the building.

"So how could the phone be here?" Annabeth looked at me, hoping for an answer, but I brushed her off and walked like a zombie over to the door.

"Don't know. Good luck with that."

"And where are you going?"

"Fresh air." I said, stepping out the door and leaving all the commotion on the inside, grabbing my coat as I left the flat, facing the killer himself, leaning smugly on the cab door.

"So you're the killer are you?"

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