V.C. Andrews 
Black Cat [EPUB ebook] 

She hid her true self. Now the truth will be revealed.Living a life of lies under the thumb of her widowed, spiritually-obsessed mother, Celeste has been forced to take on the identity of her dead twin brother, Noble. She’s almost forgotten what it’s like to be Celesteexcept for the one thing that keeps her sane: caring for her darling daughter, Baby Celeste. But when Celeste’s mother marries a kindly neighbor, a new breed of poisonous secrets and vicious enemies will force Celeste to do what she mustto survive the darkness…