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The "music box" of the title of this low-budget, routine gangster film is a submachine gun, and its owner Larry Shaw (Ronald Foster) is the focus of attention. Larry has as little concern for morality or human life as an exterminator does for cockroaches, and so he is able to climb up the ladder of organized crime with little difficulty. The setting is New York in the 1920s, when mobsters become both rich and famous and eventually dead because of Prohibition. For inexplicable reasons, Larry is married to a decent woman (Luana Patten) who one day has had enough of her husband's activities and rebels in a most significant way.