(A/N- Camp Half-blood is in England, and the gods are on top of Big Ben. It starts with exactly the same beginning as the first Percy Jackson book, except with Lizzy in it. Lizzy goes with Percy on his quest to rescue their mum and the lightning bolt with Annabeth and Grover, even though Chiron advised against it as 4 isn't a good number for a quest. But Lizzy survives, obviously, and it starts at the end of summer, before Lizzy and Percy are about to go home to their mother. They're in the Big House, saying goodbye to Annabeth.)

DISCLAIMER- the only character I own is Lizzy. I don't own any Harry Potter/Percy Jackson characters.

A/N- Lizzy and Percy and Annabeth etc are all going to be eleven because it makes everything easier for me to do. The ages follow the Harry Potter ones rather than the Percy Jackson ones, so the timeline is a little off. Sorry.

"I'll miss you, Annabeth! Write to me, okay?" I asked, hugging her.

"Of course I will!" Annabeth laughed, before turning to Percy. "Bye, Seaweed Brain." Annabeth smiled at him.

"See ya, Wise Girl." he replied, smirking. Annabeth headed out to the decking, until something swooped over her head; it was a tawny owl. It flew in through the open doors, landing on my shoulder, and it presented its leg to me. It had an envelope attached to it. I frowned at my brother and Annabeth.

"Annabeth, your mum's symbol is an owl, right?"

"Yeah, but she doesn't use them for delivering letters. None of the gods do. Whatever's in that envelope isn't from them." she said uneasily. I took the letter off the owl, and it flew away again, and I saw the envelope was sealed with some sort of crest: a lion, an eagle, a snake and a badger. Underneath was the word Hogwarts.

"Um, maybe you shouldn't open it, Lizzy." Percy said worriedly, taking a step towards me.

"It's addressed to me." I said, showing him the front. And, sure enough, it was.

Elizabeth Jackson

Cabin 3

Camp Half-blood

Half-blood Hill

London

"I'm opening it." I said determinedly, before I ripped it open and read the letter inside. When I'd finished, I looked up at Percy, before I felt light-headed and dizzy, and everything went black.

I woke up a few minutes later, I think, lying on the sofa. The first thing I thought was, 'I can't believe it. I fainted.' I was really annoyed at myself for passing out like an Aphrodite kid, when suddenly I remembered why. I sat up, only to be pushed back down again by Chiron. Percy and Annabeth were beside him.

"Rest. You must have had quite a shock." he said calmly.

"Chiron- the letter. Is it- am I- can it be true?" I stuttered.

"Yes, I'm afraid it is." he sighed heavily.

"Chiron, I still don't get it. What's the letter talking about?" Percy asked.

"It's saying that Miss Jackson here- is a witch."

Silence. The first thing that came to my mind at his words were old hags with warts, riding around on brooms and cackling. Chiron seemed to read my mind because he went on to say,

"Not those stereotypical witches, but wizards and witches, boys and girls, who are born with magical abilities. They go to schools with others of their kind and are trained in the art of magic. Their whole kind lives in secret, though, just as we do from mortals. Except they call them muggles, people without magical ability. However, young Lizzy here has been born with such abilities." Chiron explained. Percy still looked puzzled, but Annabeth asked her question first. "But Chiron, how come Percy isn't like that?"

"See, there are many cases in which a child is born magical even though the rest of their family is muggles, or they are from muggle heritage. Sally Jackson and Percy are both muggles but, for a reason that is still unknown to the world, Lizzy has magic within her. In lots of cases though, witches and wizards will be born from other witches and wizards, or have a parent of muggle and magical. It's very complicated, so I wont go into much detail about blood statuses. There are usually 3 types, though: muggle born, where you have non-magical parents but you yourself are magical, like Lizzy; half-blood, which is one of each, a bit like here having a godly parent and a mortal parent; and pure-blood, where you have two magical parents who aren't muggle born." Chiron told them.

"So, that letter... That was for Lizzy to go to one of those schools?" Percy asked, sounding as if he didn't really want to know the answer.

"Yes. Lizzy has been accepted at Hogwarts School of Witchcraft and Wizardry."

"I don't want to go!" I knew I sounded like a baby throwing a tantrum, but I didn't care. "Chiron, please, I really don't want to."

"I'm sorry, Lizzy, but you have to." said Chiron solemnly.

"I'm really sorry guys, but I have to leave. Lizzy, I'll Iris message you tonight, okay? Everything will be fine, I promise." Annabeth cut in. I nodded. I understood. She was going back to her dad's for summer, and being late wasn't going to be the best start to trying to build up their relationship again. She zoomed out of the room, and I turned to face Percy.

"But, if I go... I'll only see you at holidays..." I trailed off, choking up. No, you are NOT going to start crying I told myself firmly. Percy came over to me, and hugged me tight.

"You should go." he said, pulling away, his eyes damp too, I might add.

"W-what?"

"You need to learn about this magic. You have a whole other life waiting for you to explore. You're still going to have me, Dolphin, just not all of the time." he told me quietly.

"Are you sure?" I asked him softly. He nodded, and emotion welled up inside of me, but I pushed it down. "So, Chiron, what do I do?"

"You've got the list of equipment you need to buy?" Mum asked me anxiously.

"Yes, mum."

"And you know where you're meeting her?"

"Yes."

"And you know what-"

"Mum, she's going to be fine. And we've got to go now or we're going to be late." Percy cut her off. She gave us both a tight hug (again), before we set off for London center. It was a few days after I received my letter, and it had a note inside saying we were to meet a Professor McGonagall today to buy my equipment and for her to explain to me some of the special arrangements that would have to be made. Mum couldn't get time off work, and I didn't want to go alone, so I asked Percy to come with me. I didn't show it, but I was really nervous, and a little bit excited too. We got off the Underground, and set off up town, looking for a pub called 'The Leaky Cauldron'. We finally found it, but there was no one waiting around the building, and for some weird reason, all the other people on the street didn't seem to see the building.

"Do you think it's a bit like the Mist?" Percy muttered. I nodded, still scanning the street for the professor, but all I saw was a tabby cat. Suddenly, the cat wasn't a cat anymore- it was a slightly elderly, stern looking woman who wore long black robes and spectacles. I knew instantly this wasn't someone to cross. But then she smiled at us, and her face seemed a lot friendlier because of it.

"Hello! You must be Elizabeth? And you must be Perseus, I believe? I'm one of the Professors at Hogwarts school, Professor McGonagall." We both flinched at the use of our full names, hating anyone who used them, but she didn't seem to notice. "I'm going to show you around Diagon Ally, the main shopping street in one of our wizard villages. I trust you brought money?" I showed her a wad of cash I had brought. "Good. First we will need to exchange it for some wizard money in Gringotts, the bank. I have also found out that one of your ancestors was a wizard, and left your family a volt and some inheritance. Come along." She led you through the pub and out to a bin yard with brick walls. Percy and I exchanged a worried glance.

Anytime you were in a dead end with a stranger was never a good one for a demigod. But I must've missed her tap something in the wall, because next minute there was a large arch opening onto the weirdest and most wonderful street I had ever seen.

Hey! This is the first of (hopefully) many chapters. Please leave reviews below- all constructive criticism welcomed with open arms! Hope you like it!