The autumn equinox is here, and Caitlyn Le Fey is excited by the upcoming masquerade ball to celebrate the festival of Mabon. Not only is it a chance to dress up in glamorous costumes, but-with the Widow Mags catering-the villagers might finally put their prejudices aside and appreciate the delicious treats from her grandmother's chocolate shop. What's more, with the dreamy music and romantic dancing, Caitlyn might even get her first kiss with the dashing Lord James Fitzroy!

But on the night of the ball, Caitlyn barely has time to sample the decadent caramel fountain, or help her old vampire uncle search for his missing fangs, before a guest is brutally murdered. Was he killed by witchcraft? Who was the mysterious woman seen following him? And why did he lie about his identity?

Many at the ball might have wanted him dead, from a jealous ex-lover to an old foe seeking revenge, but to Caitlyn's horror, it's her cousin Pomona who becomes the top suspect. Although Pomona has been acting strangely and showing a disturbing interest in black magic, ever since she was given a cursed diamond, Caitlyn refuses to believe that her pretty, bubbly cousin could be capable of murder!

With the help of her quirky witch family, a few chocolate spells, and a pony with a sweet tooth, Caitlyn is soon close to finding the real killer. But solving the mystery could also mean facing a shocking truth about her own family and the secrets of her past...