"Maigret had no idea that what they are now starting to talk about here will soon lead him to close a case that they will henceforth call "Maigret's longest case" on Zlatníký embankment.

The Paris Criminal Police is back on its feet. There was another robbery at a jewelry store, but this time a rank-and-file policeman lost his life. No sooner has Maigret proven his innocence in the false accusation affair than he continues to investigate serial thefts. All clues lead to Manuel Palmari, but he is soon murdered. But who could be interested in silencing a terminally ill gangster? And where to start the search? Maigret does not go far and begins by questioning witnesses right in the house where Palmari lived. His instinct will not let him down even then.

The story is loosely based on the Maigret defends audiobook.