Three best friends, a lake house, a secret trip -- what could go wrong? It was supposed to be the perfect prom weekend getaway. But it's 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 answers--most of all, Claire. She remembers Friday night, but after that... nothing. And now Kat and Jesse--her best friends--are missing. What happened on the mountain? And where are Kat and Jesse? Claire knows the answers are buried somewhere in her memory. But as she's learning, everyone has secrets--even her best friends. And she's pretty sure she's not going to like what she remembers.