The Magic Goes Away

From Author Wars - https://authorwars.com/publications/the-magic-goes-away-271664.html

Overview:

Title: The Magic Goes Away
Author: Larry Niven
Year: Unknown
ISBN-10: 0441515479
Publisher: Ace Books
Price: $2.50
Pages: 213
Binding: Paperback
Type: Chapter Book
Title Reference: The Magic Goes Away
Notes: Sixth printing as per the number line. Cover credited to "Boris".