Posing as a magazine writer, Erskine (Efrem Zimbalist Jr.) dogs the trail of celebrated Parisian ballet dancer Danielle Chabrol (Claudine Longet), whom the Feds suspect of being a Communist spy. At present, Danielle is a guest at the Hawaiian estate of retired US diplomat Eric Reeverson (Michael Rennie). Her plan is to romance Reeverson and extract some top-secret information, which she will then relay to her Hawaiian contact James Kellogg (Russell Johnson)--who, conveniently, is Reeverson's next-door neighbor. But this scheme takes a deadly turn when Reeverson's son Glen (played by a young Harrison Ford) falls for Danielle himself. ~ Hal Erickson, All Movie Guide