Medical student Amy Brenner is spending the night on a locked psychiatric ward. Amy has been dreading her evening working on Ward D the hospital’s inpatient mental health unit. There are very specific reasons why she never wanted to do this required overnight rotation. Reasons nobody can ever find out . And as the hours tick by Amy grows increasingly convinced something terrible is happening within these tightly secured walls. When patients and staff start to vanish without a trace it becomes clear that everyone on the unit is in grave danger . Amy’s worst nightmare was spending the night on Ward D. And now she might never escape.