For Lucy Stone, the best thing about Christmas in Tinker's Cove has always been the annual Cookie Exchange. But the usual generosity and goodwill is missing from this year's event which turns out to be a complete disaster.

Petty rivalries and feuds that have long been simmering finally come to a boil, leaving a bad taste in the mouths of many guests, including Lee Cummings who accuses Tucker Whitney of stealing her recipe for low-fat, sugar-free cookies. But the icing on the cake is when Tucker is found strangled in her apartment on the following morning.

Who could've wanted Tucker dead badly enough to kill her? Despite all of the ingredients for danger, Lucy sets out on the trail of a murderer and soon uncovers a Christmas secret best left wrapped.