"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 Mérisi
Siegfried Rauch
Alexandre Rignault
Katia Tchenko
David Tonelli
Janine Souchon
as Dismissed companion (uncredited)
Michel Zemer
Producer
James Hadley Chase
Book
Edmond Ténoudji
Co-Producer
Jean Delannoy
Director
Daniel Boulanger
Writer
Gérard Ducaux-Rupp
Annie Charvein
Editor
Christian Matras
Director of Photography
Michel Legrand
Original Music Composer