During the Christmas season, Margery and her team of dinner ladies are called upon to cater the green room at Ittonvale Winter Festival. But this year, a storm threatens to ruin the holiday fun. And so does an unknown threat.

Elliot, a high-profile food vendor, is found unconscious with a severe head injury, lying among toppled Christmas decorations. When it's revealed that Elliot argued with a rival stall owner the night before, Margery and Clementine know they must stay on high alert. The police can't get down to the site until the storm clears, leaving everyone trapped.

Including the attacker. As Margery and Clementine get closer to the truth, they uncover a web of jealousy, competition and long held grudges among the vendors and other guests. They must solve the case before someone else mayhem turns to murder.