A hatter in a provincial town (Michel Serrault) leads the life of a respectable citizen but is in fact a serial murderer. The only person to suspect this is his neighbour the tailor (Charles Asnavour).
| Actor | Role |
|---|---|
 Michel SerraultLéon Labbé | Léon Labbé |
 Charles AznavourKachoudas, le tailleur | Kachoudas, le tailleur |
 Monique ChaumetteMme Labbé | Mme Labbé |
 François CluzetJeantet | Jeantet |
 Isabelle SadoyanAlice Kachoudas | Alice Kachoudas |
 Jean ChampionLe sénateur Laude | Le sénateur Laude |
 Bernard DumaineArnoult | Arnoult |
 Aurore ClémentBerthe | Berthe |