The autumn equinox is here, and Caitlyn is excited to attend the masquerade ball to celebrate the festival of Mabon. It's a chance to dress up in glamorous costumes, and—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 Caitlyn barely has time to sample the decadent caramel fountain, or help her old vampire uncle search for his missing fangs, before a guest meets an untimely end. Many had reasons to wish him ill, from a jealous ex-lover to an old enemy with unfinished business but to Caitlyn's dismay, it's her cousin Pomona who becomes the top suspect. Although Pomona's been acting strangely lately and showing a troubling fascination with dark magic, Caitlyn refuses to believe that her pretty, bubbly cousin could be involved!

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 answers. But solving the mystery could also mean facing surprising revelations about her own family and the secrets of her past...