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...
Commissioner Jules Maigret
Lily
Cicero
Bonfils
l'inspecteur Lognon
la patronne de l'hôtel
Lucienne
l'inspecteur Torrence
Pozzo
Charlie
Docteur Fezin
Bill Larner
Harry Mc Donald
Bidoine
Le garçon du 'Manhattan'
Le pharmacien Dullac
Un inspecteur
Curtis
Un inspecteur
Un inspecteur
L'employé des cartes grises (uncredited)
Un inspecteur (uncredited)
Un inspecteur (uncredited)
Un consommateur (uncredited)
Riquet (uncredited)
Un inspecteur (uncredited)
L'inspecteur Groussard (uncredited)
Un agent (uncredited)
Le concierge de l'hôtel
Un inspecteur (uncredited)
Un inspecteur (uncredited)
Un agent du commissariat (uncredited)
(uncredited)
(uncredited)
Le patron du café (uncredited)
