During the week between Christmas and New Year's, the year-round population of Key West, Florida, faces a tsunami of tourists and snowbirds. It doesn't help that outrageously wealthy key lime pie aficionado David Sloan has persuaded the city to host his pie-baking contest. Every pie purveyor on the island is out to win the coveted Key Lime Key to the City and Key Zest food critic Hayley Snow is on the scene to report it. Meanwhile, Hayley's home life is turning more tart than sweet. Hayley's new hubby, police detective Nathan Bransford, announces that her intimidating mother-in-law is bearing down on the island for a surprise visit. Hayley offers to escort Nathan's crusty mom on the iconic Conch Train Tour of the island's holiday lights, but it becomes a recipe for disaster when they find a corpse among the glittering palm trees and fantastic flamingos. The victim—Au Citron Vert's controversial new pastry chef—was a frontrunner in Sloan's contest. It's bad enough that Hayley's too-curious mother-in-law is cooking up trouble. Now, the murderer is out to take a slice out of Hayley. Can she handle the heat of a killer's kitchen?