When a stranger attempting to deliver a cryptic message is shot dead at his table, Dr. Richard Ames is thrown headfirst into danger, intrigue, and other dimensions, where a plot to rescue a sentient computer could alter human history...
The Cat Who Walks Through Walls (The World As Myth)
ISBN 13: 9780441094998
Publication Date: June 01, 1988
Publisher: Ace Books
Author: Robert A. Heinlein