Walter and Vivian live in the country and have a difficult time keeping servants. Walter then hires a private detective who has been fired for arresting the District Attorney. They only way that Walter can get Jerry to work for him is to tell Jerry that his life is in danger; the neighbor is trying to take his wife; and that Nazi spies are everywhere. Jerry needs a cook for his 'cover' so he gets his fiancée Susan to work with him. To keep Jerry working, Walter sends the threatening letters to himself and hires actors to play the spies but when a real group of spies disguised as a troupe of radio actors appears on the scene, events quickly spiral out of control.
The title character is office-boy Barney. Pretending to be a deaf-mute, Barney tries to trump his detective boss Walter Babbing by tracking down the person who kidnapped Peggy Meredith, the daughter of wealthy Agnes and Trumbull Meredith.
