War-games champion Udo Berger & his girlfriend Ingeborg are on holiday. There they meet another vacationing German couple, Charly & Hanna, & a band of shady locals. They have fun, see the sights, relax. Then, late one night, Charly disappears without a trace. Desperate to solve the mystery, Udo refuses to leave, even after Ingeborg returns home. Increasingly frightened, the situation slips beyond his grasp & he suddenly realizes that the consequences of this `game` are much more serious than he ever imagined.