Commander Key Weedon (Young), a pilot with the U.S. Navy, is sent to investigate an S.O.S. emergency signal. He discovers it is the doing of a six-year-old boy, Grover Martin, whose Uncle Simon (Buttons), an airline pilot, gave the boy a blinker light as a gift. The child's mother, Amy (Shirley Jones), is an attractive widow, and Key develops an immediate interest in her. But he will have to work hard to win Amy over.
This film features examples of:
- Balloonacy: Uncle Simon ends up tying Grover and his brothers to helium balloons to fly them as one would a kite. Unfortunately, Grover cuts his tether and he goes floating for miles over San Diego.
- Cool Uncle: Simon does himself to his nephew, even if his outlandish gifts end up putting the latter in trouble.
- Romancing the Widow: Key develops an immediate interest in the attractive widow Amy.
- Military Brat: Amy is a military child, and missed not having permanent "roots". This results in her not wanting a permanent relationship with a military officer because they are constantly on the move.