A school trip to a rain-soaked island off the Irish coast is not Abbie Hartley's idea of fun ... until she hears rumours of treasure hidden by medieval monks. With her best friend Perdita she sets off to find the priceless Goblet of Dripping.

But they are not alone. Hot on their heels is a villain, an ancient Inca emperor and a curse that will turn their world upside down. With a grumpy Grandma, a wiggling wig and some quarrelsome classmates in tow, Abbie plunges into her wildest adventure yet.