In a quiet St. Louis suburb, naturalized Italian Johnny Polo is found dead from an apparent overdose of his heart medication. Sergeant Jenkins soon uncovers evidence of murder linked to local political and economic power struggles. With his chief refusing the case, Jenkins works solo, interviewing former employer Donna Loyd and enlisting Sheriff McElliott’s help. Through patient detective work and dubious witnesses, he ultimately unmasks Polo’s killer and the motives behind the crime.

Engineer Franz Bach seems to have gone astray once again. Working overtime, nagging at his wife and his parents sleeping apart lead the children to come to this conclusion. It can't go on like this. His youngest son Täve does his best to keep his father away from the very young intern Irene. Täve's 19-year-old brother, on the other hand, tries to steal his father's mistress. His wife Margarete also wants to bring a breath of fresh air into the marriage.

Co-pilot Horst Schubert is a braggart and a true Don Juan. Thus, he tells young Ilse that he is in fact an "aircraft commander". This assertion brings about an embarrassing situation, for he suddenly meets her onboard his new work place, an IL-14 charter plane where Ilse acts as a stewardess. It gets worse, however: During a stop in Varna the police appear because Horst’s former lover Madelon has vanished. At home, meanwhile, his landlady has her hands full with her lodger’s current and former playmates. Ilse decides to put an end to this mixup and since the dull captain of the plane, Richard, makes no move to confront his co-pilot about his unstable private life, the smart stewardess appeals to the rest of the crew to help her teach Horst a few lessons in love.