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When the crew aboard a U. S. aircraft is alerted by S. O. S. blinker light signals in the San Diego Bay area, Comdr. Key Weedon is sent to investigate. He discovers that the flashing comes from 6-year-old Grover Martin, whose Uncle Simon Shelley, a commercial flight officer, has given him a blinker light for a toy. A mutual attraction soon develops between Key and the boy's widowed mother, Amy; their romance is encouraged both by Simon and Amy's sister-in-law Tandy. Amy refuses to marry a Navy man because she wants a permanent home for Grover and his older brothers, Alex and Luke, and when Key announces he is being sent overseas, she refuses to accompany him. Simon arrives with some helium-filled weather balloons and takes his nephews "moon-walking" by tying the boys to the balloons and flying them like kites. Grover, attempting to locate Key, releases his anchoring rope and goes sailing across San Diego Bay. Helicopters, patrol boats, and many local residents attempt to rescue the child, but it is Key who saves Grover by commandeering a blimp, lowering himself on a life raft, and grabbing the boy as he floats by. When Key returns to Amy, she decides to marry him, preferring a permanent father to a permanent home.