On the isle of Crowstone, set upon eerie marshes with a prison as its closest neighbour, the Widdershins sisters: Betty, Fliss and Charlie, set out to break a deadly curse which has haunted their family for generations.

But the curse isn’t the only unusual thing about the Widdershins. Each of them possesses a magical object that’s been passed down the family. A scruffy carpet bag, a set of wooden nesting dolls and a gilt-framed mirror . . . none of them is what they seem.

Will they be enough to break the curse? Or will the sisters have better luck with the mysterious prisoner who claims he can help them – for a price?