"The Cat Who..." series is a collection of mystery novels written by Lilian Jackson Braun. The plot of the stories usually revolves around a murder case, which the hero solves with help of his two cats.
"The Cat Who..." series consists of 29 novels and three collections of short stories, published between 1966 and 2007. The main character of the series is journalist Jim Qwilleran, assisted by his two cats, Koko and Yum Yum. While it was occasionally criticized for repetitiveness, the series is praised for its cozy charm, as described in a New York times obituary for the series author.