"The Number of the Beast" by Robert A. Heinlein follows the adventures of four protagonists - Zebadiah John Carter, Dejah Thoris "Deety" Burroughs Carter, Hilda Corners "Sharpie" Burroughs, and Jacob Burroughs. They travel across multiple dimensions and parallel universes in a specially designed vehicle called the "Gay Deceiver." The novel delves into themes of space-time manipulation, alternate realities, and the nature of storytelling itself. Along their journey, the characters encounter various literary and mythological worlds, blending Heinlein's typical scientific speculation with metafictional elements.
 
This paperback is in very good condition, only minor shelf wear and slight creasing from being previously enjoyed.