Young Phillida Bethel's first holiday job is as her mother's help to beautiful Suzanne Kingley at the Topaz Island, on the south coast of France. But she could never have guessed that danger, romance, adventure and excitement are to come her way - in full measure. Inexperienced as she is, she has no yardstick by which to assess the fascinating American boy, Jeff Aymon. But it is the English student, Greg Somerville, who seems the only safe haven when this world of beauty suddenly becomes sinister! Their holiday adventure develops into real danger when the youngs uncover a sinister plot whichthreatens their safety...