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
as Commissaire Jules Maigret
Françoise Fabian
as Lily
Michel Constantin
as Cicero
Paul Frankeur
as Bonfils
Guy Decomble
as l'inspecteur Lognon
Paulette Dubost
as la patronne de l'hôtel
Laurence Badie
as Lucienne
Marcel Bozzuffi
as l'inspecteur Torrence
Vittorio Sanipoli
as Pozzo
Rickie Cooper
as Charlie
Roland Armontel
as Docteur Fezin
Edward Meeks
as Bill Larner
