Le crime est notre affaire is a 2008 French comedy mystery film directed by Pascal Thomas and starring Catherine Frot, André Dussollier and Claude Rich. It is based on the Agatha Christie novel 4.50 from Paddington.
- Catherine Frot as Prudence Beresford based on Tuppence Beresford
- André Dussollier as Bélisaire Beresford, based on Tommy Beresford
- Claude Rich as Roderick Charpentier, based on Luther Crackenthorpe
- Annie Cordy as Babette Boutiti, aunt of Prudence, based on Elspeth McGillicuddy
- Chiara Mastroianni as Emma Charpentier, daughter of Roderick, based on Emma Crackenthorpe
- Melvil Poupaud as Frédéric Charpentier, the youngest son of Roderick, based on Alfred Crackenthorpe
- Alexandre Lafaurie as Raphaël Charpentier, son of Roderick, based on Harold Crackenthorpe
- Christian Vadim as Augustin Charpentier, the eldest son of Roderick, based on Cedric Crackenthorpe
- Hippolyte Girardot as Dr. Lagarde, Emma's friend, based on Dr. Quimper
- Yves Afonso as Inspector Blache
- Valériane de Villeneuve as Mrs. Clairin
- Marie Lorna Vaconsin as Mrs. Valois
- Laura Benson as Margaret Brown
- Florence Maury as Diane
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