When a heat wave hits northern Michigan, Minnie, Eddie, and their bookmobile head to the beach to catch some rays and some customers. But library business is put on hold when Minnie's restaurant-owning best friend, Kristen, calls. The specialty ice cream cone treat she'd been serving to patrons was sabotaged, making some customers horribly sick. Kristen needs Minnie to sniff out the culprit fast, or the restaurant's reputation will be destroyed forever.

Minnie and Eddie are hot on the tail of the suspect when an employee from another restaurant is found dead. Could the poisoning and the murder be related? It'll take a feline to catch a felon...