In London, rich, idle socialite Ernest Bliss (Cary Grant) feels out of sorts for no discernible reason. He sees a doctor, Sir James Aldroyd, who bluntly informs him that he is suffering from too much money, and that he would be cured if he lived for a year on a few pounds per week. Bliss is so insulted that he makes a bet for £50,000 with Sir James that he can survive for a year, supporting himself solely on whatever he earns and not touching his inherited millions. He takes the Underground to Stepney Green and rents an attic room. He falls behind on the rent, but landlady Mrs. Heath is sympathetic to his plight. Finally, despite having no experience, he persuades Mr. Masters to give him a job selling Alpha stoves. After three weeks, he has not made a single sale, and Frances Clayton (Mary Brian), Masters' secretary, tells Bliss that the company, in which Masters has invested his life savings, is in danger of closing down. Then Bliss comes up with an idea to promote the product. He takes £500 of his own money—but not for his own benefit, so the bet is still on—and offers free meals cooked on the stoves to the general public. A wholesale buyer places a trial order for 100 stoves, with the prospect of purchasing 40,000 a year if things work out. Masters is delighted and offers Bliss a partnership, but Bliss instead resigns. After he finds another job, Bliss takes Frances to dinner. As they dance, she informs him that she too is leaving Masters; he offered her a partnership too, but of the matrimonial kind. Late one night, Dr. Alroyd engages a car and a chauffeur for a medical emergency. That chauffeur turns out to be Bliss. After Bliss drives the doctor back to Harley Street, Bliss informs him that almost seven months have elapsed on their bet. Dorrington, another customer, asks him to come to 11 Regents Park Gate, flat 6, which happens to be Bliss's place. Bliss's valet Clowes, with too much time on his hands, lost heavily betting on the dogs and let the flat to Dorrington. Dorrington had been practising forging Bliss's signature and had noticed the "resemblance" between the chauffeur and the absent owner so wants the chauffeur to cash a cheque for £30,000 in return for a third share. Bliss gets the cashier to give him blank pieces of paper in an envelope and returns to his flat. He reveals who he is to Dorrington and his henchman, but they do not believe him. In the ensuing fight, Dorrington slips away with the worthless envelope while Bliss struggles with the henchman. Finally a drunk Clowes emerges and hits the henchman with a bottle. Afterward, Bliss forgives his servant. Frances gets a job with Mr. Montague; he makes it clear that he wants more than a secretary, but she needs the work. When she tells Bliss that Montague wants her to do some work outside the office at night, Bliss disables Montague's car and has her hire him to take them to Montague's rendezvous. After confirming that Montague's intentions are not honourable, he takes Frances away. When his boss sacks him, he is unconcerned, but then the manager discharges mechanic Bill Bronson for standing up for him, so Bliss buys the company and orders that the manager be fired and replaced by Bill. He persuades Frances to accept his marriage proposal. Then her mother arrives with terrible news: Frances's sister will die unless she is taken to a winter resort in Switzerland. In desperation, Frances decides to marry Masters for the money she needs. She moves without informing Bliss. He finally tracks her down and, after learning why she broke up with him, fixes everything and marries her himself.

From Sweden