A librarian and her rescue cat must solve a murder discovered on the bookmobile's first day. Librarian Minnie Hamilton is trying to establish her bookmobile service in the resort town of Chilson, Michigan, with the unexpected assistance of her rescue cat, Eddie. Their first day of deliveries takes a grim turn when Eddie leads Minnie to the body of a local man, who has met a violent end. While the police begin their investigation, Eddie's instincts suggest foul play, prompting Minnie to team up with her feline companion to uncover the truth before the killer strikes again.

The premise sets up a classic cozy mystery with a unique animal co-sleuth. The inclusion of a librarian protagonist and a rescue cat suggests a focus on community, small-town dynamics, and a generally lighthearted yet suspenseful tone. Readers can anticipate a puzzle-driven plot with a satisfying resolution, characteristic of the genre. The narrative likely emphasizes Minnie's deductive skills, aided by Eddie's animalistic intuition, as they navigate the secrets of Chilson.