There was a time when I prayed for Rachel to be real. Until the night I learned she'd always planned to kill me. When Dani was eight, she fell from a building. No one believed her claim that she was pushed by Rachel ...her imaginary friend. It took years of therapy to convince Dani that Rachel wasn't real. Now fifteen, Dani wants to make it as a dancer. But a deadly freak accident sends Dani a terrifying message: Rachel is back, she's real, and she'll stop at nothing to kill Dani. Complicating matters is Jesse, the school bad boy who's being stalked by his own invisible childhood nemesis. Dani and Jesse join forces to learn why their astral tormenters are back. Their investigation leads to a horrifying discovery - and the terrible experiment that binds them to each other.