France, July 1782. During her birthday, the beautiful young Marchioness Caroline meets the attractive soldier Gaston. It's love at first sight but Gaston does not wish to make a commitment because a military career waits for him. Caroline marries then a politician but the French Revolution bursts and Caroline has to run away to escape the guillotine. By running away she meets Gaston again who decides to help her.

Maigret is called to the high-class Hotel Majestic to investigate a body. The wife of a wealthy American has been killed - but to Maigret's surprise she has a gun in her purse. He begins to follow up the handful of clues that could explain her secret life and her demise.

Loursat, a lawyer, lives with his daughter Nicole in a sinister and vast bourgeois residence. Abandoned for nearly twenty years by his wife, the brilliant lawyer has sunk into alcoholism and his relationship with his daughter is virtually non-existent. However, one day the corpse of a stranger is discovered in the residence of Loursat. Nicole, who frequents a gang of young people who escape boredom by stealing cars and other objects, is immediately suspected.

Five unemployed workers win 100,000 Francs in the national lottery. Instead of sharing the money, they buy a ruin and build an open-air cafe. But difficulties come to split their friendly group apart.