A series of crimes is being perpetrated around a famous singer. Strangely, during each of the crimes, the artist's voice is heard humming his favorite song. Suspicions lead to a chase through a nocturnal Paris, ending in a disused theater where the assassin has lured his final victim.

Inspector Pascal

Thérèse

Marny

Dalbret

Eliane Roy

Mireille

Melor

The hunter

Legal

Bernard

Acting

Planquine

Marcheau

Toby

(uncredited)

(uncredited)
November 21, 1945

Inspector Pascal

Thérèse

Marny

Dalbret

Eliane Roy

Mireille

Melor

The hunter

Legal

Bernard

Acting

Planquine

Marcheau

Toby

(uncredited)

(uncredited)
