The book is a series of diary entries by each of the 4 main characters, Captain Zebadiah, programmer Deety and her math professor father, and an off-campus socialite. The odd foursome dash off in Zeb's sports car cum spaceship, outfitted with the professor's hyperspace drive, into various fictional universes. There is plenty of sex, rivalry, and even a trip to Oz.
The Number of the Beast is also an album by Iron Maiden; see The Number of the Beast (album).
wikipedia.org dumped 2003-03-17 with terodump