A beautiful chapter of life is about to begin as Manuel Fechner, founder of a small biotechnology company, moves into an old house in Freiburg's charming district of Herdern with his girlfriend Cornelia, her daughter Pauline, and their cat. But the idyll is deceptive: the large dark stains in the basement are from human blood, a man with eerie tattoos lurks by the fence, and is soon found dead in the woods. A severely disabled wheelchair user wants to convey something to Manuel but mysteriously falls into a stream beforehand. As Manuel begins to recognize connections between the terrifying events, he himself finds himself in deadly danger.