A rival has appeared, and this time, Marilyn may have finally met her match. A new pie shop starts out offering everything but Key Lime flavor, but when they finally challenge Marilyn head on, Key Lime is their headline product. Things go from bad to worse until the owner of the rival shop turns up dead after a series of underhanded attempts at sabotaging Marilyn's store, and the original Key Lime baker is at the top of the menu of suspects.