Sea and Serpent (PJO/HP)

Amaryllis Potter never fit in, but neither did her brother Harry.
She always had unexplainable things happen that her brother never experienced, and yet he was the only one to believe her.
When a letter arrived for both of them, Amaryllis had seen it as a way out. It didn't matter how absurd it sounded when they called her a witch or the owl they entrusted their letter to hated her for no reason.

What awaited them was unveiled truths no one knew about and the origins of her birth that made all the Greek myths she loved to read and hear about more than what they were: real. And she was tangled in the middle of two impending wars with two half-brothers on both sides.