Every 40 seconds a person goes missing. In northern Idaho a group of teenage girls attend a summer camp to help them connect with nature - without technology. They're told it will be a summer of change. When the girls' houseboat is suddenly stranded in the middle of a river an odd couple comes to their aid. But what's supposed to be an act of kindness turns deadly and the girls find themselves on the run pursued through the forest by a brutal determined killer.