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.