January means ice wine season in the Niagara Falls region, but the festivities leave Charming Books owner Violet Waverly cold, still reeling from a past heartbreak. A past heartbreak who will be present at the annual midnight grape-harvest festival, and no magic in the world or incantation powerful enough could get Violet to attend. But Grandma Daisy, an omniscient force all on her own, informs Violet that she's already arranged for the mystical Charming Books to host celebrity sommelier Belinda Perkins's book signing at the party. Little do either Waverly women know, the ice wine festival will turn colder still when Violet finds Belinda in the middle of the frozen vineyard; with a grape harvest knife protruding from her chest.