Torment — Stephen R. George

Twelve-year-old April Kostanuik despises her run-down house and working-class parents. She can't belong to them. Someday, her real parents will find her and take her away to a magical new place where she can spend her days playing the piano, lost in the music she loves. Even on the day of the terrible accident, she is still full of hatred and fury … and not at all ready to die.

John and Kathleen Woodrow have the picture-perfect family. Until their daughter starts changing. Never good at math, twelve-year-old Melissa is suddenly getting straight A's. Without a single piano lesson she has become an overnight prodigy. Then there are the weird pictures she doesn't remember drawing … pictures she signs A.K. …

Pretty soon, she won't be their Melissa at all …