Totò, Vittorio and the Doctor

Michele and Gennaro work as attendants in the investigation agency "Nulla sfugge" ("Nothing escapes"). When their boss is forced to be absent from the office to follow an important investigation, the two decide to take his place pretending to be skilled investigators. Two old sisters, Ada and Ida, come to the agency to ask them to investigate the conduct of the wife of their only nephew, an American doctor from Boston, and they accept the case, which will turn to be a mess.