I watched her face process what she saw before her and wondered whether my reaction looked exactly the same. It was like looking in a mirror, right down to the beauty spot on our left cheek. She had a different sense of clothing style to mine but considering she hadn't been on the run from blood thirsty monsters for eight years, that seemed acceptable. Her lips opened slightly, trying to find words. I spoke first.

"You're her," I said allowed, my eyes not moving away from her even though I sensed the people around us beginning to ask questions.

"I'm who? Because I don't know who the hell you are. Chiron, is it possible for monsters to change shape?" Even though she asked the question, she didn't break our connection, her dark brown eyes burning with curiosity. I heard the handicapped man mumble something about the barrier and how I wouldn't have been able to get through. And that is when he realised that our confrontation was out in the open and other campers were beginning to notice the tension. He ushered us inside and we all followed, the mystery boy behind me as though he were afraid I would run. Minutes ago, we'd practically be friends and now I was back to being a stranger.

"Maybe you should start with your name… And possibly an explanation?' He said as we sat down at a ping pong table – which seemed a little odd to me but everybody else acted as though it were a normal occurrence.

"I don't know what is happening either," I glanced over at my mirror image as she watched me, hesitance flickering in her eyes. "My name is Koa Lawrence. I was born in San Francisco and I'm sixteen years old. I was adopted when I was a baby – which I guess would explain why I magically have a twin sister I never knew about. When I was eight years old, my parents were murdered by something…" My voice broke slightly at the last word. All I could hear was my mother's screams.

"You mean it was a monster?" came a voice - the boy's.

"I don't know. I was young and I only saw the aftermath of it. I ran into the room where it happened and my mother… she was still alive. She pleaded for me to sit beside her in her last moments and the last word she said was 'run' and that's what I've been doing ever since."

"Until I found you in that alleyway and I rescued you," the boy's voice perked up a little as he realised what he had done, his tone slightly smug. I saw my sister shoot him a glare.

"I could have killed it, I've been doing it for eight years," I snapped, grabbing my dagger and holding it up. I heard Chiron groan under his breath, he turned as another man walked into the room, a couple cans of diet coke under his arms. He looked around the table, his Hawaiian shirt seemed slightly out of place but he didn't care. He looked at me for a second, his eyes trailing back to my sister.

"Athena's been a naughty little goddess, hasn't she?" He chuckled. "Chiron, you handle this. I've got more important things to attend to the demi-god drama," he mumbled and left the room. Athena? I had heard of her. Sometimes I'd take shelter in a library and I'd be drawn to the Greek history aisle and sometimes even the war history books. Athena, the Goddess of Battle and Strategy. But what did she have to do with anything?

"That guy really needs some wine," mumbled the boy beside me and the others snorted a little – even Chiron.

"I don't have any idea what you're talking about and now that you've heard my story, I'd like to hear yours," I shot my words at the girl across from me, her eyes wide at my hostility.

"I'm sorry you had such a bad life, Koa. But you can't blame this on me. I didn't choose for you to be adopted or your parents murdered. You can hear my story and then, you have the right to judge. My name is Aria Cassidy. I was born right here in New York and I've lived with my… our father my entire life. His name is Daniel and he's probably one of the best fathers you could ask for, especially since he raised me himself. When I was thirteen, a satyr tracked me down and brought me back to Camp Half-blood and I have been coming here every summer since. I was claimed by Athena and I guess, you are her daughter as well."

She took a deep sigh after speaking, her eyes furrowed as she tried to relate the two stories together. Chiron cleared his throat and shook his head.

"This could be a big coincidence. Until Koa is claimed, we cannot be sure that you two are both daughters of Athena. Until she is claimed, she shall stay in the Hermes with the others." My mind whirled as I tried to process the information, still unsure of what this camp was or where monsters fit into the equation.

"Claimed? Athena? I'm really lost. I might have been running from monsters all these years but they were the only communication I really had with the world. I never stayed in one place for very long and I tried steering clear of humans. So sorry if this seems a little rude but what the hell are you on about?"

My sister – Aria – laughed and shook her head and I wasn't sure if it was a genuine one or nervous, her voice seemed to quiver as it left her lips. "Athena, the Greek Goddess of War and Strategy, Reason and Wisdom. I guess we should start with the Greek Gods. They're all real and they're alive and they have kids – us. We are demigods, half-bloods. Offspring of Gods and we inherit their godly genes, I guess you could say. When we are claimed, it means our godly parent has claimed us, basically. At camp, it's something to be celebrated since there are a lot of demi-gods that aren't claimed. Athena claimed me and sorry Chiron, but I have no doubt that she will claim Koa as well," the girl sat back, brushing her brown hair behind her shoulder before turning to me. "I just don't understand why she would separate us. I mean, why would she make you have such a hard life and I have an easy one?"

"Oh thanks," I said sarcastically, my eyes rolling and stoping mid-roll as they landed on the boy who was watching us with an expression of pure enjoyment. I glared at him and turned to Chiron who was shaking his head and frowning. "What is it?"

"The Great Prophecy, it has started."