"An old lady is far from suspecting everything that is going on behind her back, in particular what her servants are up to."
Françoise Rosay
as Mrs. Morelli-Johnson
Anny Duperey
as Marthe
Bruno Pradal
as Alain Morelli
Philippe Clay
as Jack Bromfield
Olivier Hussenot
as Me Weidman
Daniel Ceccaldi
as Gérard Chardonnet
Henri-Jacques Huet
as Judicial police inspector
Harald Leipnitz
as Victor Masson
Madeleine Barret
as
Madeleine Bouchez
as Friend of Mrs. Morelli, card player
Florence Brière
as Maid of Mrs. Morelli
Madeleine Clervanne
Corinne Lahaye
as Secretary of Gérard Chardonnet
Pippo Merisi
Siegfried Rauch
Alexandre Rignault
Katia Tchenko
David Tonelli
Janine Souchon
as Dismissed companion (uncredited)
Christian Matras
Cinematography
Gérard Ducaux-Rupp
Co-Producer
Edmond Ténoudji
Michel Zemer
Producer
Annie Charvein
Editor
Michel Legrand
Music
Jean Delannoy
Director
Writer
Daniel Boulanger
James Hadley Chase
Book