The Isenau automobil company is the region's only large company, so almost everyone in the area works together and knows each other.

A freak test drive accident kills one driver and seriously injures another, leaving testing overseer Klausner (Paul R. Henker) feeling both shocked and responsible when investigations suggest sabotage. He turns to his daughter Herta (Sonja Sutter), secretary for the company's technical director, for comfort, but her strangly distressed and inaccessible manner makes him wonder if she is somehow involved in the case.