Mika, heiress to a Swiss chocolate company, is married to celebrated pianist André and stepmother to his son, Guillaume, whose mother died in a car wreck on his tenth birthday. Their lives are interrupted by the unexpected arrival of Jeanne, a young woman who has learned she was almost switched with Guillaume at birth.
Unfortunately the movie Nightcap is not yet available on HBO Max.
| Writing | Charlotte Armstrong | Novel |
| Camera | Renato Berta | Director of Photography |
| Directing | Claude Chabrol | Director |
| Production | Marin Karmitz | Producer |
| Writing | Claude Chabrol | Screenplay |
| Sound | Matthieu Chabrol | Original Music Composer |
| Editing | Monique Fardoulis | Editor |
| Costume & Make-Up | Sonia Geneux | Makeup Artist |
| Art | Ivan Niclass | Production Design |
| Sound | Jean-Pierre Duret | Sound |
| Costume & Make-Up | Thi-Loan Nguyen | Makeup Artist |
| Sound | Claude Villand | Sound |
| Production | Gérard Ruey | Associate Producer |
| Directing | Cécile Maistre-Chabrol | First Assistant Director |
| Art | Pierre Galliard | Property Master |
| Camera | Jérémie Nassif | Still Photographer |
| Sound | Jonathan Acbard | Sound Assistant |
| Costume & Make-Up | Paul de Fisser | Hairstylist |
| Directing | Isabelle Vossart | Third Assistant Director |
| Costume & Make-Up | Cécile Cotten | Costumer |
| Production | Gisèle Vuillaume | Administration |
| Sound | André Naudin | Sound Effects Editor |
| Crew | Gustav Mahler | Additional Music |
| Production | Yvon Crenn | Production Manager |
| Directing | Daniel Maurer | Second Assistant Director |
| Sound | Pascal Vuillemin | Sound Mixer |
| Lighting | Youcef Djedra | Electrician |
| Sound | Ricardo Castro | Musician |
| Production | Gisele Musy | Administration |
| Camera | Gilles-Vincent Rieder | Grip |
| Crew | Franz Liszt | Additional Music |
| Directing | Aurore Chabrol | Script Supervisor |
| Art | Georges Ayusawa | Assistant Decorator |
| Camera | Fabrice Aragno | Grip |
| Lighting | Thierry Labille | Electrician |
| Editing | Sylvie Lager | Assistant Editor |
| Crew | Claude Debussy | Additional Music |
| Production | Francine Lusser | Unit Manager |
| Sound | Bruno Langiano | Sound Effects Editor |
| Production | Monica Donati | Publicist |
| Production | Claudia Tur | Production Secretary |
| Production | Jean-Louis Porchet | Associate Producer |
| Art | Rekha Musale | Assistant Decorator |
| Lighting | Philippe Cadeau | Gaffer |
| Sound | Aline Jaussi | Musician |
| Production | David Crenn | Assistant Unit Manager |
| Crew | Frédéric Chopin | Additional Music |
| Crew | Alexander Scriabin | Additional Music |
| Production | Hélène Platel | Administration |
| Costume & Make-Up | Max Buhler | Hairstylist |
| Sound | Michel Filippi | ADR Supervisor |
| Camera | Olivier Porchet | Second Assistant Camera |
| Camera | Dominique Robert | Key Grip |
| Lighting | Cédric Russo | Electrician |
| Production | Yvon Crenn | Line Producer |
| Camera | Jean-Paul Toraille | First Assistant Camera |
| Production | Nathalie Kreuther | Production Assistant |
| Camera | Michel Thiriet | Camera Operator |
| Production | Vanessa Balmer | Production Assistant |
| Camera | Éric Bonnaire | Grip |
| Editing | Rodolphe Molla | Assistant Editor |
| Editing | Florence Poulain | Assistant Editor |
| Sound | Laurent Petitgirard | Conductor |
| Crew | Franz Schubert | Additional Music |
| Production | Sandra Gerber | Production Assistant |
| Costume & Make-Up | Elisabeth Tavernier | Costume Design |
| Writing | Caroline Eliacheff | Screenplay |
