In this adaptation of Dashiell Hammett's "The Farewell Murder", Nick (William Powell) and Nora (Myrna Loy) Charles are back in New York with Asta and a new arrival - Nicky Jr. They are invited by Colonel Burr MacFay (C. Aubrey Smith) to spend the weekend at his house on Long Island. McFay desperately wants Nick to put his well-known detective skills to work, as he has been receiving threats from Phil Church (Sheldon Leonard), a very shady character. When MacFay is killed, Church seems to be the obvious suspect. However, Nick is skeptical. He suspects there is something far more complicated going on. MacFay's housekeeper, daughter and various hangers-on all may have had an interest in seeking the old man's demise.
According to Frank S. Nugent, "this third of the trademarked Thin Men takes its murders as jauntily as ever, confirms our impression that matrimony need not be too serious a business and provides as light an entertainment as any holiday-amusement seeker is likely to find."