 In rural Oklahoma, under the cover of night, a marina worker named Tor murders Denise, a local waitress, by slitting her throat, then dumps her body in Lake Tenkiller.The next day, a pair of co-eds, Leslie and Janna, head to Janna's summer home near Lake Tenkiller for summer break, and to get away from Leslie's abusive fiancé, Josh.At the lake, the two get summer jobs at the diner where Denise worked during previous summers.