Moving from Boston to the small town of Mayville Heights, Minnesota, librarian Kathleen Poulson had no idea that two stray cats—a catnip-loving tabby, Owen, and a black-and-white Hercules—would infiltrate her life. The summer music festival is suddenly interrupted by the murder of a conductor, Kathleen turns out to be the main suspect, but the unusual abilities of her four-legged friends save her and help solve the crime...