In this follow-up to Maigret Sets a Trap (1958), Georges Simenon's inimitable Inspector Maigret (played once again by Jean Gabin) returns to his countryside hometown to investigate an ominous letter received by his old friend, the countess of St. Fiacre. The letter portends the countess's death, and when a heart attack makes the harbinger come true, the good inspector suspects foul play. The mystery of Maigret and the St. Fiacre Case (1959) twists and turns like vines crawling up the countess's chateau, culminating in an explosive finale that finds Maigret dropping by a dinner of which all the guests are suspects.