Another Thin Man title of "Return of the Thin Man", and was followed by "Shadow of the Thin Man" (1941). 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, the former business partner of Nora's father, and the administrator of her fortune, desperately wants Nick to put his well-known detective skills to work, as he has been receiving threats from
Thin Man (nuclear bomb) materials react more rapidly and therefore more completely. It was decided that the plutonium gun would receive the bulk of the research effort, since it was the project with the least amount of uncertainty involved. It was assumed that the uranium gun-type bomb could be more easily adapted from it. The gun-type and implosion-type designs were codenamed "Thin Man" and "Fat Man" projects respectively. These code names were created by Robert Serber, a former student of Oppenheimer's who worked on the Manhattan Project. He chose them based on their design shapes; the "Thin Man" would be a very long device,