When Cat finds out that her cool new neighbour, Dr Becca Ryan, is a witch, she’s fascinated. Cat already loves magic and is sure she can learn loads. But when she turns to Becca for advice, Cat gets more than she bargained for. With her friend Shane, she ends on a quest to the island of Hy-Brasil, facing battle with an ancient and terrifying power.

The Trooping Fairies arrive in Clonbridge for their revels, awakening other creatures with mischief and chaos in mind. Cat Donnelly and her friends are planning the ultimate trick-or-treating strategy, but with the Fairies in town, this Halloween she needs all her courage and cunning to save her family.