Gangsters from the United States try to kill a key government witness whose testimony could help land an influential mobster in jail. It's up to detective Maigret to deal with the FBI and a series of underworld figures to save the life of the witness...
Jean Gabin
Commissaire Jules Maigret
Françoise Fabian
Lily
Michel Constantin
Cicero
Paul Frankeur
Bonfils
Guy Decomble
l'inspecteur Lognon
Paulette Dubost
la patronne de l'hôtel
Laurence Badie
Lucienne
Marcel Bozzuffi
l'inspecteur Torrence
