It's Halloween, one of the busiest seasons of the year for Samantha Sweet and the crew at her pastry shop, Sweet's Sweets. After baking a zillion pumpkin cookies, ghostly cupcakes, and an all-black cake for a young witch's wedding, the gang is looking forward to a gala costume party at the neighborhood bookshop. But when one of the guests is murdered and a rare book vanishes—practically in front of their eyes—the evening takes a whole different turn and Sam finds herself in the midst of another mystery.