Caroline and Cyril have recently wed and are honeymooning on the Isle of Man, a glorious spot in the middle of the Irish Sea marked by picturesque villages, rocky cliffs, and bracing winds. Caroline is immediately drawn to the island’s history of rampaging Vikings, tales of mermaids and legendary kings, and the friendly inhabitants with quaint superstitions and proverbs. In no time, she falls in love with her surroundings.

But unexplainable events unfold, convincing her sinister forces are at work. Part by accident and part by design, Edward and Leslie join the couple, and together they must identify a turned British agent, retrieve a top secret document, and learn the true meaning of the phrase, "It all comes back to the camps." Will logic and reason prevail, or will a bit of magic and island whimsy save the day?