It's Christmastime in Mistletoe, Maine, and the Historical Society has launched a widespread campaign to celebrate the town's 150th anniversary. Descendants of the founding family, the Snows, have returned for the first time, and Holly is determined to make the family's visit magical. In an attempt to put Mistletoe on the map, Holly's mother, a respected local baker, attempts to break a record by baking the world's largest gingerbread man, but her plans are whisked away when Mr. Snow's body ends up in the batter.

When Mr. Moore, the local mistletoe farmer, is accused of the crime, Holly reprises her role as amateur sleuth to protect the sweet older man. Between hosting the inconsolable Mrs. Snow and other guests at the inn, receiving threatening messages telling her to stop her investigation, and preparing for her first wedding anniversary with Sheriff Evan Gray, she might need a Christmas miracle to survive.

When someone breaks into Holly's office and scratches a warning into her desk, she knows she has little time left. Can Holly uncover the killer before someone else gets burned, or is her involvement a recipe for trouble?