While sifting through closets of junk in the mansion they have rented, Qwill and Koko uncover a mystery involving the suicide of the former owner and the murder of a potato farmer.
Jim Qwilleran, crime reporter turned editor, first meets Kao K'o-Kung, a pure-bred Siamese cat whom he calls Koko, and they become an unstoppable pair of investigators.
When Qwilleran decided to do a feature series on the antique dealers of Junktown, he didn't know he would stumble onto a murder. It's up to Jim and his talented cats Koko and Yum Yum to solve the crime.