Fake private detective Mike Spillone (Totò) is hired by two old ladies to find out if Brigitte (Abbe Lane), the wife of their nephew Otello Bellomo (Germán Cobos), has a lover. Brigitte is a physician but the two aunts are unaware of the fact. While investigating, Mike and his assistant Johnny (Agostino Salvietti) discover Brigitte with a prospective patient, the Marquis De Vitti (Vittorio De Sica), who was shot by the husband of the woman he tried to seduce. Afterwards, Spillone finds her with her husband and believes he is her lover. (from Wikipedia)