It's October in Maine, and everyone in Tinker's Cove is preparing for the annual Halloween festival. While Lucy Stone is whipping up orange-frosted cupcakes, recycling tutus for her daughters' Halloween costumes, helping her son with his pre-teen rebellion, and breastfeeding her brand-new baby, an arsonist is loose in Tinker's Cove. When the latest fire claims the life of the owner of the town's oldest house, arson turns into murder . . .

While the townsfolk work to transform a dilapidated mansion into a haunted house for the All-Ghouls festival, the hunt for the culprit heats up. Trick-or-treat turns deadly as a little digging in all the wrong places puts Lucy too close to a shocking discovery that could send all her best-laid plans up in smoke . . .