While younger, handsomer actors were off fighting WW2, pudgy, middle-aged James Dunn suddenly found himself playing leading roles again. In Leave It to the Irish, Dunn is cast as private investigator Terry Moran, with Wanda McKay as his peppery assistant Nora O'Brien. The Hibernian hero and heroine join forces to solve the murder of a wealthy furrier. Alas, the trail of evidence leads to Terry as the most likely suspect, compelling Nora to simultaneously solve the case and clear her boss. Practically the only character in Leave It to the Irish who isn't Irish is principal villain Maletti, played by Jack LaRue.