Archie Moffam is an Englishman in New York. Like Bertie Wooster he's kind hearted but mentally limited, if not negligible. Unlike Bertie he has no private income. He's a veteran of the First World War.
During a stay in New York he bitterly criticises the service at the Cosmopolis Hotel, thus making an enemy of its owner, Daniel Brewster. On a subsequent trip to Miami he meets, falls in love with and marries Brewster's daughter Lucille. Brewster is not delighted. Archie's attempts to make amends by finding employment and by purchasing a valuable objet d'art for Brewster end in disaster. Further indiscretions follow for Archie: he upsets Lucille by apparently paying too much attention to an actress; he bets $1000 on the Giants (then a New York baseball team), but gets into a fight with their star pitcher and injures his arm. He advises Lucille's brother, Bill, who has a habit of getting into relationships with girls of whom his father disapproves, and lends a hand to an old comrade from the war, "The Sausage Chappie", who's lost his memory and forgotten his own name. He upsets Mrs Cora Bates McCall, a vegetarian and healthy food campaigner, by persuading her son to take part in a pie-eating contest. Then there's an incident with a painting which further upsets Brewster. Eventually he pacifies the old curmudgeon by telling him he's about to become a grandfather.