In this Halloween episode, Emerson and Olive track down a "ghost" who's been killing the jockeys at the old race arena where Olive used to race as a former jockey herself. With help from Ned and Chuck, they try to solve the big mystery.

A woman dies in a scratch-and-sniff book explosion. Was the scientist who wrote the book the target of the explosion, or was this part of an intentional publicity stunt gone horribly wrong?