"After five thrilling and hazardous years as intelligence agent attached to the army nurse corps, dynamic little Major Susan Merton accepted her honorable discharge from the army with a deep sign of happiness. For the first time since her marriage to Tam (Lt. Colonel MacDuff), she could have a quiet life with her beloved husband. A trip to San Francisco results in her being asked by Major Delton to help unravel a neat little plot which concerned the State Department, the Russians, and a certain South American country."