"Your, your, you're my sister?" I asked in complete shock. How? Poseidon had another child with the same women? My mom never told me about this. I figured if there was something she was hiding she would have told me by now, guess not.

"I-I guess." she replied. She looked scared.

"Um, I really don't know what to say. "

"Me too."

"Well I need to get my friend, and you can come with us." I said just realizing that she was the enemy at the moment.

"No! I serve Gaea! I don't care if you're my brother or not!"

"What? Listen, Gaea is a liar. She uses half-bloods and when she's done with them or doesn't need them anymore, she completely abandons them. They are left alone with no money, family, shelter, and the one place they would think to go, they can't because they are the enemy."

"But she promised me information."

"Well you have a brother now, so you know who your parents are."

"But- But," she inhaled deeply "very well, I will help you as long as you help me figure out more about myself."

"I promise. I think I have a few questions about you to."

"Ok. Your friend is probably in the deepest chamber. The remaining monsters are preparing the sacrifice to Gaea. With a son of the big three, she will surely be awoken. But we must hurry. "

"Alright, let's go."

We ran down to a tent that had a trap door on the ground. Sofia yanked it open revealing a staircase going straight down. We ran down the steps as quickly as possible. As we were walking so many questions flooded my head. What would my friends at camp think and Annabeth. Also about Sofia too. Why didn't I know her? Why didn't she live with my mother and me? I swore that as soon as I got home I was going to have a serious talk with my parents.

I was so distracted that I didn't realize that we had come to a stop. "Wow." Right in front of us were several jail cells, just like an ordinary prison. In the cell right in front of us was Jason. He was on his knees and was chained up. His shirt had rips and he was smeared with dirt. Looking at him I couldn't help think of Beckendorf. How I had lost him on a mission just like this. No I thought. I am not loosing this time. As Sofia walked to him he looked up. She quietly grabbed a key and opened the cell. She used another key and opened his chains. Was it really this easy? Just then a dracaene slithered over and I turned her into a pile of dust before she could even call for help.

"Percy a little help here." Sofia asked as Jason pinned her against the wall

"Oh. Hey, Jason it's all good here. She's, she's um my twin." I said as I helped Sofia

"What? Your twin? Dude quit messing." he said

"Yeah we'll talk about it later. But first we got to get out of here." I said as we hurried to the staircase

We all Jason got his sword back and we began climbing up the stairs.

"Why hasn't anyone noticed that Jason is missing?" I asked Sofia as we ran up the stairs

"Well the dracaene you killed was supposed to bring him to the sacrifice room. They don't know we have even gone yet." She replied

"Oh, good to know." I said as we ran

About five minutes later we reached the end and climbed out of the trapdoor. We closed the door and put some heavy objects so that the monsters would have a hard time getting out. I whistled for Blackjack and Guido. They came and immediately Sofia gasped.

"Their beautiful!" She exclaimed as she petted Blackjack's mane.

Blackjack's voice in my head, uh boss, who's she? She looks just like you. Creepy.

Sofia shook her head and took a step back. "His voice, it was in my head, it was talking!"

"Haha yeah being a child of Poseidon, well, you understand horses, and sea creatures."

Child of Poseidon? So she's like your sister?

"She's like my twin Blackjack. Yeah big surprise I know. But for now we have got to get out of here."

"Yup, and we should leave like right know." Jason said

As if on cue, the trap door exploded and the monsters busted out. There were probably 20 but it didn't matter, we had to leave.

"Come on, Blackjack will take us. And Jason will take Guido." I said as I helped Sofia on Blackjack

We lifted up into the air and a spear flew right past my ear. The monsters were attacking. Sofia pulled out an arrow out of her necklace that magically turned into a quiver, and shot it with her bow that transformed from a bracelet. She knocked two arrows and killed two earthborn on impact. They must have had celestial bronze tips because no other metal killed monsters so fast. She still had her stygian sword strapped to her waist. Seeing her more clearly, I realized I had a beautiful sister. Even in her long grey sweater, black leggings, and black buttoned Ugg's, she looked gorgeous. I wondered if I looked as good as she did, you know, being twins and all.

"Yes! We lost them!" Jason yelled.

"Yeah! But we also found something very important." I yelled back

Jason grunted back. Sofia slid back against my chest and immediately began sleeping. It was weird; we treated each other as if we had known each our whole lives. But the way she had accepted returning with us to camp, was as if she had been expecting me. I tried to balance Sofia's weight, so I could rest, but I couldn't sleep. We would arrive at camp in 2 hours or less and I had to tell everyone about my twin. I didn't know what kind of person she was. If I could trust her, what Annabeth would think of her? What Chiron would say, I mean she was another child of the big three? What my mother would say when she saw her daughter again. Oh boy, did I have a lot of explaining to do.