Silent Bloodnight is a 2006 horror film written, directed and produced by Stefan Peczelt and Elmar Weihsmann.Synopsis
At a lake, the mentally handicapped Nina spots her brother Jacob, his girlfriend Jamie, and their friends Tony and Sammy skinny dipping. Nina follows Jacob and Jamie into the woods, observes them having sex, and is dragged off by Tony and Sammy. When Jacob and Jamie finish, Jamie goes off alone, and is chased by a man who has murdered Tony and Sammy. The man drowns Jamie in the lake, while Jacob (who was looking for Nina) watches in shock. Jacob goes to the police station, where he tells the chief that he received a call from his father, Willy, who he thinks has committed suicide.