Celeste - Virginia Andrews

He was her mirror image. Now the mirror has cracked.
Celeste and her identical twin brother, Noble, are as close as can be - until a tragic accident takes Noble's life. It's a loss that pushes their mother, a woman obsessed with New Age superstitions, over the edge. Desperate to keep her son 'alive', Celeste's mother forces her to cut her hair, wear boys' clothes - and take on Noble's identity. Celeste has virtually disappeared - until a handsome boy moves in next door, and Celeste will risk her mother's wrath to let herself come back to life.