The dumb answer: Why not hire a librarian to OPEN the book?
The simple, least satisfactory answer: Someone got a bum copy of 13 FOR CORWIN.
A more complex answer: Carefully look in the back of the book. The 1993 paperback reprint is listed at 110 pages.
The most satisfactory answer: Google the book on Amazon. Click on a "Look inside this book." Leaf back from The Back Cover. Anyone will find Robert Nathan's kind of afterword, a prose poem, in which he writes of listening to Walter Cronkite talking about going into Outer Space, hears the words of a young Norman Corwin, closes his eyes in a reverie, and begins to imagine Corwin's voice replacing that of Cronkite.
As Doug, the original owner of the splendid old Edinburgh Castle Bar on Geary Street, used to say to Todd Baesen before his banishment: "Nay-x-t!"
At Anyone's service: