Penny’s abusive father is dead – but she still hears his voice in her head, encouraging her to hurt those around her. She can’t go to school or be around her friends or even draw with a sharp pencil without her intrusive thoughts urging her toward violence. Desperate to get a handle on her OCD, she agrees to spend the summer at Camp Whitewood – an exclusive therapy retreat in the woods. She feels optimistic when she arrives. The other girls all have their reasons for being there, which makes Penny feel a little less alone. But then she starts seeing things that can’t possibly be there: the gold watch her father was buried with, his favourite whiskey spilled on her cabin floor – a terrifying figure she calls the Shadow Man looming at the foot of her bed. Penny thinks she is losing her mind, but when a girl goes missing, and is later found dead, it’s clear that whatever is happening at Camp Whitewood isn’t all in her head.