Dreading another week of dieting, librarian James Henry and his supper club friends decide to spice things up by taking a Mexican cooking class. The mood is festive and the meals are almost good enough to make James forget about cheese doodles. But when another member of the class is found dead, what started as a quest to make the perfect quesadilla turns into a sizzling murder investigation. Determined to track down the culprit, the Flab Five are stunned to learn that one of their own is being grilled as the main suspect. With time running out and Quincy's Gap boiling over with fear, James and the supper club will have to concoct a plan to trap an elusive criminal with an appetite for murder.