It's autumn in New England and Truly and her fellow Pumpkin Falls Private Eyes are gearing up for the annual Halloween Festival. Aunt True and her new husband, Rusty, have bought Ethel and Elmer Farnsworth's dilapidated old farm on the edge of town, where they're going to raise sheep and where Truly and her grandparents have volunteered to farm- and sheep-sit while the newlyweds are on their honeymoon.

But as always, there are mysteries and secrets afoot in Pumpkin Falls. Jack-o'-lanterns outside the shops downtown are going missing--in broad daylight! Plus, someone...or something...is trying to scare Truly's aunt and uncle away from their new property with some seriously spooky hauntings.

With the arrival of Emilio, a new heartthrob student from Italy, and with Calhoun most definitely still in the picture, Truly has her hands full and will need all of her Private Eyes to help her solve the small town shenanigans this fall season.