The fake private detective Mike Spillone is hired by two old ladies to find out if Brigitte, the wife of their nephew Otello Bellomo, has a lover. Brigitte is a physician but the two aunts are unaware of the fact. While investigating, Mike and his assistant Johnny discover Brigitte with a prospective patient, the marquis De Vitti who was shot by the husband of the woman he tried to seduce. Afterwards Spillone finds her with her husband who he believes to be her lover.
Totò
as Michele Spillone detto Mike
Vittorio De Sica
as Marchese Vittorio De Vittti
Abbe Lane
as Dottoressa Brigitte Baker
Titina De Filippo
as Madre del marchese De Vitti
Germán Cobos
as Avvocato Otello Bellomo
Agostino Salvietti
as Gennaro
Rafael Bardem
as Professor Elia Vagoni
Franco Coop
as Il maître della 'Conchiglia'
Fulvia Franco
as Caterina
Dante Maggio
as Cameriere
Pierre Mondy
as Romeo
Luigi Pavese
as Capo dell'agenzia investigativa
