In the elegant Parisian hotel 'Medici' the millionaire David Ward is found dead in the bathtub. Not an accident, as Maigret quickly finds out - bruises on the dead man's neck clearly point to murder. The case proves to be extremely complicated for the commissioner and forces him to travel. In Switzerland, he meets Muriel, Ward's third wife who was about to get a divorce. In Cannes, he meets the former husband of Countess Irina Palmieri, the millionaire's lover who disappeared after a suicide attempt. At the Palace Hotel in Lausanne, Maigret finally makes a decisive discovery. Based on the 51st Maigret novel, Maigret. With Lucas hopelessly lost, Maigret must put him on the right track. Based on the 50th Maigret novel Maigret s'amuse (1956), published in German under the titles Maigret als Zuschauer und Maigret amusiert sich (1957)