Disclaimer: 'Percy Jackson and the Olympians' and most of the characters don't belong to me.

Author's note: This is my first story. I am not a native English speaker (to tell the truth I rarely speak it) so there might be some grammatical mistakes. Sorry for them. You should know a few things before you start. In this story, the Heroes of Olympus never formed, although the Romans exist and should appear later. There will be some supernatural characters not belonging to Greek mythology. This is not going to follow any single storyline. Sorry if I disappoint you, but there won't be any pairings for Percy Jackson here. Thank you.

1. Where it starts

It was a sunny day. Billy Carlyle never liked the heat much. Of course, you are not supposed to like anything at all when facing a case like that.

"Sir", one of his cops came in, "someone called Mr. Brunner is looking for you. Says you called him."

"Yes, send him in."

A few seconds later, two people entered the room. One in a wheelchair, the other one pushing it. The man on the chair was middle-aged, had brown hair and beard, "Ah, Billy my boy! Long time no see."

Billy Carlyle bowed a little, "Chiron", he glanced at the girl standing behind. Mr. Brunner, who was actually the immortal centaur Chiron, said, "Meet Marietta, one of my campers."

"Marietta Romero." Billy shook her hand, "Daughter of Demeter."

"Billy Carlyle, son of Athena."

Chiron propelled his wheelchair forward, where a dead body of a young man lied. It was a strange scene. His body held a few wounds, with no particular form. Some looked like beast claws, some looked like sharp blades and some looked like neither of them. Stranger, you could not see even a single drop of red. As if the blood has been poured out of his body. On the for-head, there was a symbol burned. A bird spreading its wings.

Billy stood aside, "Recognize the face? I do, back from the camp. Never knew him well though."

Chiron nodded, "Neville Beedland. A son of Apollo. I remember him very well. One of the few kids of Apollo with a little gift of prophecy. Sometimes he had visions of the future. Small details, nothing major, but visions all right."

"What is the symbol?"

"I have no knowledge of this."

"I thought you would know. That's why I called. You know about myths and supernatural phenomenon better than almost anyone alive." Billy bit his lower lips, "And what could have killed him like that? Wounds in the body, not no blood? Where did all the blood go? Is there any kind of monster in the world who could have done that?"

"Again my boy, I have to disappoint you. I have no idea, this is new to me."

"You know anyone who might….say, won't disappoint me?"

Chiron became silent for a while, having a thoughtful look on the face. The same face after a while, brightened, "There may be someone…..this land is full of strangest of things my boy. I am the half horse trainer of heroes, my father was a titan. Yet the world amazes me. Very few people nowadays dare to deal with the unknown. I know only one, who probably faced more kinds of monsters than anyone in the history. He might."

Billy's eyes lit up in recognition, "Of course! Why hadn't I thought of him? ...Percy Jackson! He might know. Can you contact him? Iris message may be?"

"I can try of course, but there is no guarantee we will find him. You know, he was never the same after the accident. After the death of your sister, and young Nico Di Angelo…."

Billy nodded sadly, "I never could've imagined Annabeth would die like that, in a stupid car accident. Who knew the architect of Olympus along with the only son of the king of the Underworld would go to the same place so soon? Extraordinary people like them dying so normally in such a young age?"

Mood of the room has changed already. Despite the heat, a coldness grabbed their heart. None spoke for a while. More specifically they couldn't even if they wanted. There are situations when you have to become speechless, whether you are the son of Athena or the son of Kronos.

At last Chiron broke the silence, "I must leave now. I shall try to contact Percy, see if anyone knows where he is nowadays. You keep working on the case. It is a good thing Billy that you joined the force as detective. We need demigods inside the police for cases like that. Good Bye"

"Chiron?"

"Yes dear?" Chiron asked Marietta, "Anything bothering you?"

"Not actually…what was the full name of that girl, the one who designed the new Olympus?"

"Annabeth Chase."

"How long ago did she died?"

"Almost been five years. Long before you came to the camp."

"We all hear of her, you know? Whenever Katie comes, she never stops the stories. The stories of Annabeth Chase, smartest daughter of Athena. The tales of Percy Jackson, the greatest hero ever…..I can't always believe her you know. I mean, there were Hercules, Perseus, Achilles, Theseus, and so many more. How can a teenage boy be greater than them? Greater than the legends? Do Katie brag? You knew them all Chiron, what do you think?"

Chiron chuckled, "Yes, Katie is one of Percy's best friends…..well, I can't really tell you who the greater hero is. The definition of greatness varies from people to people. I can only tell you only something I believe in."

"And what do you believe?"

Chiron thought for a while, "I have lived a very long time young one. I have seen a lot. I have seen people to lose everything, I have seen them to break down. Some says great heroes never find a happy ending. May be its true. Few heroes like Perseus could fulfill their purpose in the world. Why couldn't others? Because they are destined to fail one day? That is what Percy Jackson refuses to believe. He faced things someone of his age should never have to. He lost things, many things. But Percy Jackson never gave up. You know Marietta, before he left I asked him where he was going. He said, he has lost too much, he doesn't fear it now. He wants to see the world, he wants to live it because if you grief too much, what will others do who needs you?" Marietta helped Chiron to get inside the car, "He is great because he never wanted to be great Marietta. For those who fought the second titan war, Perseus is not only a leader. He is a hope"

"Ya' can only hope fishtail, but that would be pointless."

Somewhere in the world, we don't need to specify where, a small ship was floating on the large ocean. If you met one of the crews, you would know they are not that much of a pleasant people. To tell the truth, they were ruthless criminals. Anything with a price? They will do it having their eyes blindfolded. They loot, hunts and capture, and one thing just been captured is going to make them rich.

They caught a mermaid! A living mermaid!

There has always been legend among the pirates that mermaids were legend. Some tried to catch one, some even said they have seen them. But no one, no one at all succeeded.

Until today.

It was luck mostly. Crews of the ship never tried to catch one, though they believed they existed…..almost. And today, suddenly a strange human like creature rose to the ocean surface. One of them saw the creature, and threw a net. That's how they caught the mermaid.

To tell the truth, it was a very young mermaid. Merpeople never come to the out world. But this one is special. She was a mermaid demigod. A daughter of Demeter.

Sons and daughters of Demeter always preferred the earth to anything. They have a connection to the earth. They always try to stay near it. You will rarely find a demigod of Demeter living in cold countries or deserts. Very few mermaids are demigods actually. She was one of them. And the young mermaid made a mistake.

Her name was Nemeida. Her father is a general in Lord Poseidon's army, one of their peoples' leaders. It has always been her dream to see the world outside. Of course, her father never let her visit it. He said it was dangerous, filled with greedy people who would thought her a freak of nature. She never listened to him. It sounded like a monster story to her, made up for children. But that doubt is gone now. The pair of eyes which were full of excitement once was replaced by fear now.

And then…BOOM! What was that?

The man standing in front of the cage looked confused. What was that? Suddenly everything became silent outside. Except the sound of the ocean itself. The ocean never rests.

Someone walked inside, a young man with messy black hair and sea green eyes. The man became more confused, "who the hell are ya'?"

He didn't answer. Instead he glanced at Nemeida and smiled, "Hunger, isn't it? Hunger for a little adventure? But you shouldn't have come to the surface like that kid, this is not your home. You have to be more cautious."

The other one didn't find it funny, "Hey, I asked you something. Who the hell are you?"

"That is not important. But you shouldn't kidnap kids you know?"

"That is not a kid, that's a….."

"Yeah yeah I know, a mermaid….but, that's not important right now. I guess you are not letting her go, are you?"

"Err…of course not!"

The young man smiled, "Thought so", and then he moved.

BAM!

Nemeida couldn't believe her eyes. In a blink the new comer jumped like a torpedo and hit the other one. He fell on the floor unconscious.

"So, how are you feeling kid? They didn't torture you or anything, did they? I am sorry I couldn't come early." He took out a ball pen and removed the cap, it turned into a glowing bronze sword. Nemeida's eyes became as large as a football.

"Oh my gods!" she whispered, "It's you… The prince of the ocean!"

He chuckled, "Smart one, aren't you Nemeida? Well, I don't like to call myself a prince actually, that would be my brother Triton. I am just a lone explorer… but I am Percy Jackson, at your service!"