Meredith Hendricks happens to be the best cop in her quiet town on Lake Tahoe. When a black-market exotic species dealer named Clint is paroled from prison, something he let loose begins to make its presence known. Swimmers and land-lovers alike begin to become part of the food chain at an unbelievable rate. Meredith and her team discover that they're not just hunting one eating machine, but a whole family of them. Not everyone will make it out alive, but those who do will never forget this summer at Shark Lake.
Criminal psychologist Kate Fuller is assigned to the murder of a man who has seemingly been strangled in his sleep by his wife and the only witness is their eight-year-old daughter, Sophie. As Kate digs into the mystery of an ancient demon which kills people in their sleep, she experiences the same petrifying symptoms as all previous victims and spirals through a chilling nightmare to save herself and Sophie before she dares fall asleep again.