Girl detective Sally Holmes and her corgi sidekick Sherlock are at it again! This time, Sally stumbles on a case while out at the new carnival in town. Fall is in the air, there are dozens of rides she's excited about, and Nicole, the kindly fortuneteller, has just given her an amazing glimpse into her future as a detective. But there's no time to celebrate. When Sally hears a bloodcurdling scream coming from the fortuneteller's tent, she's worried that something bad has happened to Nicole.

The problem is, the fortuneteller has disappeared from her tent, and when Sally asks around, she's told that nobody named Nicole works at the fair at all. Everyone in the tight-knit family running the fair seems to be hiding something—but what? Why is everyone acting so suspiciously? What happened to Nicole? And what's up with the creepy old lady that keeps skulking everywhere?

Something fishy is definitely afoot, and Sally knows that the only way this case will get cracked is if she and Sherlock solve it themselves. Join your favorite sleuthing duo for yet another twisty mystery with plenty of fiascos—and fun!