What happened while they were sleeping?
 A school for the deaf takes an overnight trip to the snowy woods. Five teenagers go to sleep, but only four wake up. Leon is missing, and a teacher's body is found in the forest…

 Sign language interpreter Paige Northwood is brought in to help with interrogations. Everyone at school has a motive for murder - but they all have an alibi.  

 As Paige becomes increasingly involved, she suspects there's something sinister going on. With the clock ticking to find Leon, only one thing is certain: the killer is among them, and ready to strike again…