 Gilles KneuséThe director | The director |
 Peter HudsonDr. Sheppard | Dr. Sheppard |
 Gilles Gaston-DreyfusHercule Poirot | Hercule Poirot |
 Célia CatalifoFlora Ackroyd | Flora Ackroyd |
| VVincent DeslandresNot listed | Not listed |
| GGhislain de FonclareNot listed | Not listed |
| FFrançois LequesneNot listed | Not listed |
 Carole RochelleMrs. Ferrars | Mrs. Ferrars |
 Héloïse RauthCaroline Sheppard | Caroline Sheppard |
 Benjamin TholozanNot listed | Not listed |
| JJulien UrrutiaNot listed | Not listed |
 Pierre BayardSelf - Professor of literature | Self - Professor of literature |
 Denis BertrandSelf - Semiotician | Self - Semiotician |
 Neel BurtonSelf - Psychiatrist | Self - Psychiatrist |
| GGeorges MoréasSelf - Former chief of police | Self - Former chief of police |
 Malcolm NeesamSelf - Historian | Self - Historian |
 Andrew NormanSelf - Writer | Self - Writer |
 François RivièreSelf - Writer | Self - Writer |
 Agatha ChristieSelf (archive footage) | Self (archive footage) |
| JJoanna GrudzinskaUrsula Bourne | Ursula Bourne |
 Gérard Dessalles(voice) | (voice) |
 Enrico Di Giovanni(voice) | (voice) |
 Jean-Gabriel Nordmann(voice) | (voice) |
