The Cat Who… [abridged]

When Jim Qwilleran's friend Polly decides to spend two weeks on vacation with an old girlfriend in Oregon, he finds himself at a loose end—but not for long. A visit from Nick Bamba brings news of a hotbed of mystery. Nick and his wife fear that their new venture, the Domino Inn, won't see out one summer season, let alone a lifetime. A series of fatal accidents on the recently developed Breakfast Island is beginning to deter further visitors, forcing Jim and his cats, Koko and Yum Yum, to scramble for clues.

Soon after banker Willard Carmichael and his young bride arrive in Pickax, a string of petty burglaries follow. Then Willard meets his demise—an apparent victim of a mugging—and the banker's home restoration project goes to the widow's cousin. Though the clues are as elusive as a cat burglar, the suspicious Qwill and his feline companions, Koko and Yum Yum, are determined to catch a thief—and a killer.