Blackmailer Stronk is back on the island, and so are Renate Feller and her lover Jens Hartmann. When Stronk suggests a drive into the mountains, where he intends to find Renate's husband and prove to her that he knows he is alive, Renate and Jens decide to take their own car. In a dangerous bend in the mountain road, Stronk's car leaves the road and crashed into a deep ravine. Stronk is killed in the accident. The only witnesses of the accident are the two passengers in the following car, Renate's husband Harald Kuhn, and the hermit in whose cave Harald has been hiding out. Though safe now from the blackmailer and his demands, they all are suspecting each other of having tampered with Stronk's car.