When his fiancée leaves him, ventriloquist Jerry Morgan (Danny Kaye) alarms his manager, Marty (David Burns), with a violent outburst directed at his two dummies. After promising Marty to see a psychiatrist over his behavior, Jerry takes his broken dummies to a shop -- where, unknown to him, the repairman is a spy who plants vital secret blueprints in the wooden dolls. Jerry then becomes the target of several determined spies, as well as a stunning psychiatrist (Mai Zetterling).