What if you opened an ordinary door in the attic and discovered a desert island, complete with palm trees, parrots... and pirates?

Merryshields isn't your average big country house - it's massive, mysterious, and undoubtedly the most magical mansion the world has ever seen. Hidden deep in the countryside, abandoned for years, it is surrounded by trees and filled with secrets bursting to be discovered.

When cousins Piper, Jack, Willow and Kit move into Merryshields, the magic is beyond exciting... at first. A silver dog?! A ghostly cook?! A self-drawing map that shows treasure?! But then the cousins spy a flag waving from a window high among the rooftops and before they know it, the magic of Merryshields begins to intensify...

Behind the attic room door, pirates Johnny Two-Legs and Taishi are awaiting rescue from Bad Babs, the Witch of the Seas, who raises storms, senses gold and steals children. But before Piper, Jack, Willow and Kit can rescue them and save Merryshields, they find themselves trapped as Babs sails nearer - and her sights are set firmly on the Merryshields treasure that she can sense through the waving palms...

Can the children save themselves and their beloved magical house? Or will they be trapped forever in a strange world, working as slaves for Bad Babs Bembridge's evil empire?