Aided by two of his criminology students (Keye Luke and Max "Slapsie Maxie" Rosenbloom), inscrutable gumshoe Kentaro Moto (Peter Lorre) investigates the murder of a prizefighter poisoned during a boxing match. Lynn Bari, Jayne Regan, John Hamilton and Ward Bond also star in this third entry in the popular detective franchise. Extras include the documentary Mr. Moto Meets Mr. Chan: The Making of Mr. Moto's Gamble.