Maigret is visited by a friend from childhood, someone he hasn't seen in decades. This friend, Leon Florentin, tells Maigret of Josee', a woman he's been in love with, a woman who has other lovers, and this woman is now dead. Murdered. The suspects include Josee's lovers (which includes Florentin) and the concierge of the apartment building in which Josee' lived and was killed.
The mystery is a good one and worth watching as the suspects' stories unravel, and it really is more an unraveling of threads than a series of uncovered facts and big reveals. Maigret presses on his friend again and again-like scratching at a scab-to get at what really happened in that apartment. This episode deviates slightly from George Simenon's novel in how Maigret gets at the truth, but it aligns with the book's ending (which would have been tedious to script and film). Roger Pierre as Florentin and Marianne Groves as the concierge are a treat to watch, capturing those crucial roles nicely.