The listing, NEW Boxed Set (4) LILIAN JACKSON BRAUN MYSTERY THE CAT WHO... Books has ended.
Up for auction is a sealed (shrink wrapped) boxed set of "Cat Who" books. The set is paperback and has a price sticker on the bottom of $19.96. The books individually were published in 1988. This boxed set is a 1992 publication (prices on boxed sets are higher now).
From the Wikipedia: "The Cat Who... is a novel series of murder mystery novels by Lilian Jackson Braun. This series is called the "Cat Who..." series because each book title in this series begins with the words "The Cat Who. . .".
"Cat Who..." books feature a reporter named Jim Qwilleran and his Siamese cats, Kao K'o-Kung (Koko for short) and Yum-Yum. The first book in the series was written in 1966." There are now at least 29 "Cat Who" books.
If you would like to get a start on reading this series of books, this is a good way to do it. Would also make a nice Christmas gift for the reader on your list!