Jim Qwilleran is on a diet. He discovered he could not catch his breath while chasing Koko, his chocolate brown Siamese cat, at the veterinarian clinic. Once the irritated Koko finally settled and got his teeth cleaned, the vet recommended Jim see Doc Beane, so Jim, taking Beane's recommendation to lose 30 pounds, started the new diet.
After a day of near starving, Jim weighs himself. He is dismayed to find he is 3 pounds heavier after dieting all day! Appalled, he becomes more determined to lose weight. Deep in thought as he steps off the scale, he doesn't notice Koko removing his paws from the scale.
More bad news waits for Jim at work. The boss, the managing editor, has a new assignment for Qwilleran. The newspaper, Daily Fluxion, needs a gourmet columnist, a job which means eating at all of the local restaurants to write critiques and recommendations. Qwilleran has been selected as the new gourmet critic!
Qwilleran is on the wagon and he's on a diet, but he decides not to make a fuss. He realizes he will be able to take home lots of goodies to his two cats, Koko and Yum Yum. They have already torn up his apartment after he tried to change their diet of fresh food to cheap canned cat food once. Things look even better when Mary Duckworth, a delightful woman he met in the previous book, and a member of a Gourmet Club, recommends he visit the Maus Haus where the Club meets, which is the home of an attorney, Mickey Maus. He goes to the club meeting and meets many chefs and restaurant owners, so it's easy setting up dates to visit their restaurants for his column. The house is very strange and huge, it's design reminding Qwilleran of an Egyptian temple, with a pottery operation in back. The building is a boardinghouse for artists, including restaurant owners. And newspaper writers! A room is available to rent, and Qwilleran takes it.
After he moves in, very upsetting events soon occur. Qwilleran was already warned that a suicide had happened at Maus Haus years before, so he has been nosing around. There certainly are lots of odd characters, lovable and not so lovable, sharing the dining table with him at meal time. The previous night at dinner he saw Gourmet Club members who were the owners of the rival newspaper, the Morning Rampage, although they aren't regular diners as those who live in the studios are. He learns that one of the residents, Joy Graham, had a cat who never came home. Then, Joy, his old girlfriend from high school, who he had discovered was the resident pottery artist along with her less talented husband Dan, vanishes! Dan claims she moved to Florida, which Qwilleran knows Joy hates. But she HAD borrowed money from him because she said she was going to get a divorce. Then, another resident disappears!
But that's not the worst of it, as horrible as what has already occurred is. Coming home after an assignment to review a restaurant out of town, with a possible new girlfriend accompanying him - the housekeeper Mrs. Marron tearfully explains his 'Home Alone' cats have had an unfortunate incident!
Qwilleran almost goes insane. And dear reader, me too! Me too!