George and her new friend Timmy the Dog are joined for the holidays by her cousins Julian, Dick and Anne. The Five set out to investigate a long-ago curse involving Kirrin Island, but it soon transpires they are not alone in their quest.

The theft of a priceless new code machine by enemy agents sends the Five on an eventful train journey up to Scotland.

After a chance encounter with a circus magician, the Famous Five set off to find the mysterious Eye of the Sunrise and keep it from falling into the wrong hands.