The Mooring(2013)

Every 40 seconds a person goes missing. In northern Idaho, a group of teenage girls attended a summer camp to help them connect with nature without technology. They were told it would be a summer of change. As the girls' houseboat is suddenly stranded in the middle of the river an odd couple comes to their aid. What was suppose to be an act of kindness turns deadly as the girls find themselves on the run, being pursued through the forest by a brutal and determined killer.