Some of the most popular titles in "The Cat Who..." series are "The Cat Who Moved a Mountain," "The Cat Who Blew the Whistle" and "The Cat Who Said Cheese." Other popular titles are "The Cat Who Tailed a Thief" and "The Cat Who Sang for the Birds."
"The Cat Who..." is a series of mystery novels written by Lilian Jackson Braun and published by G. P. Putnam's Sons. The first three books came out from 1966 to 1968, with the fourth one appearing in 1982 and a new release every year thereafter until 2007. Together, there are 29 books that tell the story of James Mackintosh Qwilleran, or "Qwill," who lives with his two cats, Koko and Yum-Yum, and the crime and murder mysteries that they solve. A 30th book remains unpublished after the author's death in 2011.