Two members of the French Academy agree to help the attractive young veterinarian Esther investigate the suspicious death of her sister. Esther is convinced her brother-in-law is responsible, but soon it becomes apparent that those responsible are linked to the very highest echelons of power in the Vatican.
Unfortunately the movie My Brother-in-law Killed My Sister is not yet available on HBO Max.
| Directing | Jacques Rouffio | Director |
| Art | Jean-Jacques Caziot | Production Design |
| Writing | Georges Conchon | Screenplay |
| Writing | Jacques Rouffio | Screenplay |
| Production | Giorgio Silvagni | Producer |
| Sound | Philippe Sarde | Original Music Composer |
| Camera | Jacques Loiseleux | Director of Photography |
| Editing | Anna Ruiz | Editor |
| Art | Sylvie Bruno | Set Decoration |
| Art | Jean-François Cousson | Set Decoration |
| Art | Gérard James | Set Decoration |
| Directing | Vincent Canaple | Assistant Director |
| Production | Annabella Andreoli | Unit Manager |
| Production | Pascal Cassotti | Unit Manager |
| Production | Stéphane Cowen | Unit Manager |
| Production | Jacques Innocenti | Unit Manager |
| Production | Martine Noujaim | Unit Manager |
| Production | Daniel Riché | Production Manager |
| Production | Marina Spinola | Unit Manager |
| Costume & Make-Up | Jean-Max Guérin | Hairstylist |
| Costume & Make-Up | Catherine Demesmeaker | Makeup Artist |
| Costume & Make-Up | Nathalie de Belleval | Makeup Artist |
| Costume & Make-Up | Evelyne Byot | Makeup Department Head |
