The Holly Tree (Demigod Story)

Holly, daughter of Hades, had once died in a fire and went to be reborn. On her way to be born, she had written a letter about her life to have her future self read.
Thirteen years later, Sky, daughter of Poseidon gets a letter that told her of her past life. She had been wondering what was happening to her for she had been beginning to look more and more like a child of Hades. The thing that she questioned the most was her new fear of fire, she had never been in a reason to fear fire. Once Sky opened the letter and read about her past life, memories of her past life had come back and she physically transformed into Holly.
Although Sky and Holly might be of the same soul, they are different in nearly every way. To make the matter worse, the two personalities juggle around in the one body causing a condition that is usually mistaken for multiple personality disorder.
Even though the demigods might be different in many ways, they do one thing in common; to reach a goal. The goal? To slow down the Romans from finding Camp Half-Blood by doing nearly anything imaginable.