When thefts occur in Pickax and two people from Pickax are murdered, journalist Jim Qwilleran and his Siamese cats, Koko and Yum Yum, start investigating.

James Qwilleran is enjoying a vacation at the Nutcracker Inn, but the tranquillity is soon interrupted when one of the other guests is found dead, and feline detectives Koko and Yum Yum do their best to help Qwill solve the case.

While the town of Pickax is swept up in its sesquicentennial celebrations, Koko has developed a strange new hobby: He drops himself from balconies, occasionally landing in the oddest of places. When a young man comes to visit his wealthy relatives, Koko plummets straight onto his head! Meanwhile, a hurricane is brewing, and the visitor's family members soon fall deathly ill. Qwill has his work cut out for him as Pickax-as foreshadowed by Koko-is about...

Qwilleran is not happy with his new assignment to write about interior decorating in a new weekly magazine. Then someone burgles the residence featured on the front cover and kills the lady of the house. Suddenly, Quill finds himself and his feline friend in the midst of a murder investigation.

The cat who saw red: Something is amiss at Maus Haus. Not just the mystery of an unsolved "suicide" which hangs over the old mansion, but something ominous in the present-day residence. When Qwilleran moves in to work on his new gastronomical assignment, strange things begin to happen. First it's a scream in the night, then a vanishing houseboy. But when his old girlfriend disappears, something has to be done. Qwilleran, Koko and Yum Yum set out to...

The Great Food Expo is disrupted by a bomb blast and journalist Qwill sets out to investigate with the help of Siamese cats, Koko and Yum Yum.

Jim Qwilleran and his Siamese companions, Koko and Yum Yum, move into Junior Goodwinter's grandma's home. Everything goes well until the discovery that this apparently happy and healthy 88-year-old seems to have commited suicide.