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. Three went up the mountain, but only one came back. 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. That weekend changes everything. 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.