It was supposed to be the perfect prom weekend getaway. But its clear something terrible happened when Claire wakes up alone and bloodied on a hiking trail with no memory of the past forty-eight hours. Now everyone wants answersmost of all, Claire. She remembers Friday night, but after that . . . nothing. And now Kat and Jesseher best friendsare missing. What happened on the mountain? And where are Kat and Jesse? Claire knows the answers are buried somewhere in her memory. But as shes learning, everyone has secretseven her best friends. And shes pretty sure shes not going to like what she remembers.