My first Percy Jackson fanfic so don't be mean if it kinda sucks in the beginning. There will be OC's.

I don't own Percy Jackson just the plot of the fanfic and my oc's. I wasn't sure how old Nico was so I put that he was 14.

Chapter 1

A blond haired girl with stormy gray eyes watched two figures sparring, each held their own blades in hand, and one had a joyful smile on his face. He was around 16, he had black hair and sea green eyes and he wore an orange camp half-blood t-shirt, a pair of ripped jeans, and some black converse. He moved his sword swiftly and gently.

The other male was around from his young face and that he was a couple inches shorter than the first male. Unlike the other male his face showed that he was fully focused, he had black hair, like the first, and dark brown eyes. He wore a black t-shit with a skull and cross bones on it, black shorts, and black Nike's.

The older male gave a smirk and knocked the blade out of the younger's hand. "Gotcha!"

The blond girl gave a smile, while the younger male pouted slightly. "Give me a break Percy!" Percy walked over to the blade he knocked out of his sparring partner's hand and picked it up.

"Not a chance, Nico" Percy put the pen cap on his sword and he turned it back into a pen. He looked to the blond girl coming their way. "How'd he do now, Annebeth?" She gave a thoughtful smile

"Better but still hesitant" Nico frowned while Percy took Nico's sword with the others hanged on the wall.

"What do you expect? I'm used to using my little skeleton friends to fight"

"Reason why you're training now" Stated Annebeth. Nico shrugged. Percy smiled a bit and patted his shoulder.

"You're getting better. So don't worry about it-"

"Percy!" The three turned to the person that spoke who just came into the training area. One of the Hermes kids. She jumped up to Percy.

"Chiron wants to talk to you!" Percy looked at her confused. "Why?" The girl shrugged. "I don't know. Something about Grover I think" Percy looked at Annebeth and Nico with a worried look.

"Chiron?" Percy called through the big house, Annebeth and Nico behind him.

"Good afternoon, Percy" The three turned to the centaur that was playing cards with Mr.D. "Hey Chiron, you called for me?" He nodded.

"Yes, you see I got a message from Grover" Mr.D rolled his eyes and drank his diet coke.

"Great more of them" He mumbled. "As Mr.D just said, Grover seem to have found a half-blood and has called for your assistants" Percy nodded in understanding.

"So did he figure out who their parents are?" Asked Nico.

"Nico, he says since the smell of monsters is strong and it covers the demi-blood" Annebeth raised a brow. "Where is Grover?"

"Florida" Percy and Annebeth paled abit. It's been years since they last went and the memories flooded back to them. They shuddered slightly. Nico looked confused noticing their pale faces.

"What's wrong with Florida?" Annebeth shook her head. "Lots of monsters in Florida because of the Sea of Monsters" Nico blinked still confused.

"Sea of monsters?" Percy remembered that he hadn't learned this stuff yet. "Aka the Bermuda triangle" He said simply. Nico's eyes widened slightly and he nodded. "Oh"

Chiron spoke "So, are you going-"

"Of course I am" Percy cut of Chiron. He knew that Percy would go before he even asked. Annebeth nudged him. "Of course you aren't going without me" Nico shrugged. "I'll come along" Mr.D shrugged

. "Getting rid of couple brats. Maybe they'll die on the way" He mumbled. Chiron rolled his eyes then smiled gently at the three teens. "Good, I'll send Grover an Iris message while you get ready" The three nodded and walked to their cabins

Percy and the other two waited at the airport. Percy had a nervous look on his face. "P-plane?" Nico rolled his eyes.

"Don't worry there's a shortcut here through the underworld" Percy sighed in relief while Annebeth looked at Nico.

"Really?"

"Yea, Dad gave me a map of the Underworld tunnels only takes an hour at most to get to places, a day if you're not careful." Percy smiled. "Thank the gods. No planes"

Nico chuckled and Annebeth gave a small laugh. "Time might pass while-"Annebeth cut him off.

"Yea, we know. So where's the tunnel" Nico blinked then smirked. "We're on it"

As soon as he said that they fell through a hole that came out of nowhere. "Ahh!"

It seemed as soon as soon as they fell through they got out. Percy rolled out of the tunnel and crashed into a tree. "Ouch!" Annebeth flew out and landed on Percy.

"OW!" Yelled Percy. Nico walked out calmly. "We're here" Annebeth stood and dusted the dirt of his jeans. He looked around.

"Where are we specifically?" Percy asked rubbed the back of his head. "About a mile where Grover should be meeting us" Percy nodded then hit the back of Nico's head.

"Ow! Why'd you do that?" Yelled Nico, grabbing the back of his head. "Next time give us a little warning before we fly through the Underworld!" Annebeth rolled her eyes but laughed. "Guys, let's go find Grover" Percy nodded and Nico shrugged.

They found Grover at empty McDonald's. Percy walked behind him quietly and yelled. "BOO!" Grover jumped and dropped his soda. Annebeth started to laugh while Nico chuckled. Grover turned to them like he was about to yell at them until he took a small pause to take a good look at them.

He smiled and glomped them. "Percy! Annebeth! Nico! It's been awhile!" Annebeth hugged him back. "Grover it's been a month" Grover let them go and smiled sheepishly. Percy and the others sat down.

"I found two"

"Two?" Asked Annebeth a bit surprised. "Where?"

"A summer school not far from here but because of the monsters surrounding the area I can't tell which god parent they have" Grover explained. Percy and Annebeth nodded in understanding. Nico looked bored.

"Yea, we heard. So how do we get them to camp?" Grover looked nervous.
"Well you see that's going to be difficult." Nico raised a brow in question, Percy and Annebeth stayed silent. "Why?"

"Three reasons- "He said while lifting his hand up and showing three of his fingers.

"One of them got anger issues-"He put one finger down. "The other got trust issues" He out another one down.

"And at the summer school there are more than 15 monsters" The three teen had a jaw dropped.

"More than 15!" Whispered Percy harshly. Grover nodded nervously. "Must I remind you? It's Florida! Even Disney got couple monsters around there"

Percy slammed his head to the table. "I thought I wouldn't need to fight for awhile after that whole battle a couple weeks ago but nooooo!" Annebeth turned her head to Percy.

"Percy life is never that easy for us. Anyway do you think one of them is the child of the big three?" Percy lifted his head.

"Hmm would make sense ….dad did tell me that he,Zues, Hades did met some mortal women." Nico nodded in agreement. "Dad did say something about that" Grover shrugged.

"I haven't seen them do anything like what you guy or Thalia do….but it might be possible. Annebeth stood up. "So Grover take us to this summer school"

After an hour Grover and the three teens stopped walking. They were right in front of the school. "Whoa!" Said the three teens at the same time. The school had 5 buildings each were 3 stories tall.

"Did I forget to say that this was a school for rich people?"

"Uh yea!" Yelled Annebeth. Grover laughed sheepishly. "Hehe. Well then welcome to Livington Academy."

Percy, Annebeth and Nico followed Grover to the front office. Looking around the school campus like it was a royal palace. A lady with light brown hair and brown eyes looked up when they walked in.

", who are these kids?" Grover nudged Percy. Percy looked a bit hesitant at first until Annebeth intertwined her hands with his. He smiled slightly and took a deep breath and closed his eyes. After a second he opened them and pushed through the mist like water and moved it around. He said with confidence

"We're students here, remember? I'm Percy Jackson; this is Annebeth Chase and Nico de Angelo." The woman blinked in a daze and nodded.

"Oh right….I didn't see you register for the summer school program"

"Well….uh that's because our parents just decided to put us in last minute, they called you last week." The woman seemed to think about it for a moment. "Oh that's right! I forgot which classes you all had. Just stay with here for a moment until I can get you your schedule" They nodded and watched her walk to the back.

Percy smiled and turned to Annebeth. "I did it!" He whispered. Annebeth hugged him. "See I told you that you could control the mist" Before anyone else something bumped into Nico. A short yelp was heard. Nico caught himself before falling on to the ground, everyone turned to the girl on the ground.

The first thing they noticed were the streaks of red in her dark brown hair, she looked around 14. She wore a black hoodie and dark skinny jeans. Paper was all over the floor. She looked up at them showing her sea green eyes.

Annebeth's eyes widened when she saw them. 'They look like Percy's' she thought to herself. The girl looked back to the ground. "Uh…S-sorry" She started to pick up the papers on the floor. Nico knelt down and helped her with the rest of her papers.

"Here" The girl didn't give him any eye contact. "T-thanks" She left the papers on the counter and was about to leave when Grover grabbed her arm.

"Serena calm down it's just me and a couple of friends." Serena looked at him then the others. "Oh…..uh" She looked back down. Grover smiled and pushed her gently to the others.

"Guys this is Serena. Serena this is Percy Jackson, Annebeth Chase, And Nico de Angelo" Serena gave a small wave. Percy smiled and pulled a hand out to her.

"Hi, nice to meet you" Serena slowly took the hand and shook it. "Y-you t-too" Annebeth smiled and Nico gave a slight wave. He found the ground quite interesting at the moment.

Before anything else could be said they heard a yell from outside on the courtyard.

"Phoenix! Get off of me! Get that razor away from my head!" Grover's eyes widened and looked at the four teens. "I'll be right back!"

Grover ran out the office. Serena looked at Grover with eyes with sudden horror about being left alone. She watched him leave and then turned to look at the three older teens. She stayed looking at the ground and spoke.

"So h-how did you meet Grover?" Percy smiled.

"Well we used to go to school together a couple years ago"

"I met him before Percy did. I met him when I first started summer camp" Stated Annebeth with a smile.

"I just met him around a year ago at the same summer camp" Said Nico. Serena nodded. "O-oh"

"How did you meet him?" Serena seemed slightly surprised at the question. She gave a small smile. "W-when school started he was sent to be my mentor. Lots of people get in trouble here so the p-parents ask for a mentor to keep their kid's in line."

"So everyone in the school gets them."

"No just the freshmen or troubled students" Nico raised a brow. "Which are you?" Annebeth hit the back of his head. Serena giggled. "I'm a freshman."

Before anyone could say anything Grover came back holding a blond girl fighting and yelling for him to let go.

She had black streaks in her hair and blue eyes. She wore a gray tank top and jean shorts. She kicked and punched the air. "Grover let me down!"

"Morgan-"

"It's Phoenix! Damn it Grover out me down!" Serena frowned then walked over to Grover. She looked at Phoenix.

"Nix calm down. Grover is trying to make sure you don't get in trouble" Soon Phoenix calm down.

"I know" Grover slowly let her go and ran behind Percy. Phoenix glared at him then looked back at Serena. "What did you do now, Nix?"

"Dude was annoying….so I thought I would shave the hair off his head." Serena rolled her eyes. "This was the reason why your parents sent you here"

The woman from before came back. "Here are your schedules" The woman passed three pieces papers to Percy, Nico, and Annebeth. "Thank you" All the teens left the office. Phoenix turned to the three.

"Who the hell are you?" she said a bit rudely. Grover frowned slightly annoyed. "These are some friends of mine they have some classes with me but they had to get their classes switched for summer."

"What's the reason they're here?" The three were confused. Grover shrugged.

"Percy and Nico failed a class and Annebeth's parents left for a business job in Russia" Percy and Annebeth sent a look to Grover.

Phoenix smiled. "Same here. I failed a class and my parents went to Japan." Nico looked at Serena. "You?" Serena froze. Grover took over.

"Hey Phoenix, Serena don't we have gym?" Serena unfroze and nodded. "Y-Yea!" Phoenix sighed.

"Do we have to go?" Grover nodded. "Come on…it won't be that bad." Percy looked at his schedule. "I have gym too"

"Same here"

"Me too"

"Well lets go-"Serena stuttered. "W-Wait! I left my bag at art"

"We'll wait. " Said Phoenix. Serena nodded and ran down the hall and turned left. Phoenix looked back at the three teens. "Something's weird about you….I can feel it"

Percy and Annebeth blinked in surprise. Grover looked a bit nervous and Nico looked indifferent. Before any of them could say anything else they heard a scream. Phoenix's eyes widened.

"That's Serena! I can't believe I left her go alone!" She ran down the hallway followed by Grover and the others.

I'll leave it there Plz don't be mean! It was my first try and at a Percy Jackson fanfic!