Aspiring entertainer George Trotter (George Formby) comes down to London in search of fame and fortune, but soon must try to clear his name after being accused of a murder at his lodgings.
Graf Bobby and Baron Mucki founded the detective bureau Pfiff and Greif to finally make money. Shortly before the bankruptcy of their company, they receive a lucrative order from Benevenuto Socrates Socre regarding a gang of girl traders.
An old gangster returns from the United States to Mexico City to live with his sister-in-law and his two nephews, where he will face the daily life of a middle-class family.
A young police inspector investigates the bank robbery and subsequent murder of one of the robbers, while discovering that his girlfriend has a lover, an old friend of hers and now their neighbor.
