An old lady is far from suspecting everything that is going on behind her back, in particular what her servants are up to.
| Actor | Role |
|---|---|
 Françoise RosayMrs. Morelli-Johnson | Mrs. Morelli-Johnson |
 Anny DupereyMarthe | Marthe |
 Bruno PradalAlain Morelli | Alain Morelli |
 Philippe ClayJack Bromfield | Jack Bromfield |
 Olivier HussenotMe Weidman | Me Weidman |
 Daniel CeccaldiGérard Chardonnet | Gérard Chardonnet |
 Henri-Jacques HuetJudicial police inspector | Judicial police inspector |
 Harald LeipnitzVictor Masson | Victor Masson |
| MMadeleine BarretNot listed | Not listed |
 Madeleine BouchezFriend of Mrs. Morelli, card player | Friend of Mrs. Morelli, card player |
 Florence BrièreMaid of Mrs. Morelli | Maid of Mrs. Morelli |
 Madeleine ClervanneFriend of Mrs. Morelli, card player | Friend of Mrs. Morelli, card player |
 Corinne LahayeSecretary of Gérard Chardonnet | Secretary of Gérard Chardonnet |
| Harald LeipnitzNot listed | Not listed |
 Pippo MérisiNot listed | Not listed |
 Siegfried RauchNot listed | Not listed |
 Alexandre RignaultNot listed | Not listed |
 Katia TchenkoNot listed | Not listed |
| DDavid TonelliNot listed | Not listed |
 Janine SouchonDismissed companion (uncredited) | Dismissed companion (uncredited) |