It's fall in Fallingbrook, Wisconsin, and Emily Fyne, owner of the popular local Deputy Donut café is on a trail—a Donut Trail, that is—to tour pre-Halloween treats and activities, not to mention check out the competition. It's all fun and games, until a murder that's no trick . . .

Emily and her friends Izzy and Monique are traveling the Donut Trail in style in Deputy Donut's vintage, donut-topped car. With them are Emily's cat, Dep, and Monique's tiny dog, Gigi. Amid the spectacular fall foliage they stop at an orchard that includes a bistro and a vast corn maze. But while sampling some apple cider, they find that not everyone shares their friendly, festive mood . . .

A cranky tourist not only scolds them for bringing their pets, but she also says she hates dogs—with cats a close second. No matter, Emily and company, their pets leashed, go off to enter the maze. But soon, boisterous teens barge in, wreaking havoc, tossing pumpkins, uprooting cornstalks—and attempting a dog-snatching . . .

As everyone scrambles to regroup, it turns out the dog-hating woman is missing. And when her dead body is finally discovered—with Gigi's hair ribbon in her pocket—Emily and her friends are the top suspects. To clear their names, they'll have to throw a killer off their trail while diving even deeper into a dangerous labyrinth of clues . . .