Claire and Luna are thrilled to visit an ancient castle in Scotland with their five-star-witch grandmother, Grandy. But this is no ordinary
vacation. The three witches are on a mission: to rid Glenn Bly castle
of the terrifying ghost that haunts it. The situation at Glenn Bly is
more complicated than the twins had imagined. There's prickly Daphne,
who lives with her grandfather in the castle and seems to be hiding
something. There are the awful Shrillingbirds, the absentee landlords
who now want to make Glenn Bly their permanent home. Finally, there is
the ghost himself. And when Claire and Luna meet him, the real mystery
begins… The twins turn ghost-busters in this fourth magically funny
book about these novice witches.