The Cat Who Walks Through Walls Mass Market Paperback – November 1, 1986 by Robert A. Heinlein
 
A fast-paced, science fiction romp through multiple universes from the bestselling author of Starship Troopers and Stranger in a Strange Land.

“[Heinlein] is, if possible, a greater genius than ever before...this time by giving us a thinking man’s Hitchhiker’s Guide to the Galaxy.”—San Francisco Chronicle
 
Dr. Richard Ames is an ex-military man, a sometime writer, and unfortunate victim of mistaken identity. When a stranger attempting to deliver a cryptic message is shot dead at his dinner table, Ames is thrown headfirst into danger, intrigue, and other dimensions where Lazarus Long still thrives, where Jubal Harshaw lives surrounded by beautiful women, and where a daring plot to rescue the sentient computer called Mike could change the direction of all human history.
 
 
7.4