Towards the end of World War II, the fictitious French mountain village of Molinette is occupied by German troops. Because of sleep aid, served by his French girlfriend Hélène, the German corporal Karl Küppers misses the departure of his company to Russia. With the help of the purposeful Frenchwoman he becomes Ortskommandant.

An ex-tennis pro carries out a plot to murder his wife. When things go wrong, he improvises a brilliant plan B.