Welcome back to Quincy's Gap, Virginia, where James Henry and his dieting group contend with dangerous secrets, dark intrigue, and delicious praline sundaes. Six months after starting their low-carb diet, the Flab Five are feeling motivationally- challenged. A new ice cream shop has come to town, but so has the Witness to Fitness weight loss center, run by the fanatical Veronica Levitt. Maybe Veronica's take-no-prisoners approach is just what the group needs. Between dieting, caring for his cranky father, and struggling with his growing affection for Lucy, James has his plate full. But when he and his fellow dieters poke around in an arson case that turns into a murder investigation, the Flab Five discover that they may have bitten off more than they can chew.