¡Enigma!

From Author Wars - https://authorwars.com/publications/enigma-666619.html

Overview:

Title: ¡Enigma!
Author: Ray Cummings
Year: 1962
Publisher: Cenit
Price: Pta 32
Pages: 231
Binding: Paperback
Type: Novel
Title Reference: ¡Enigma!
Notes:
- Data from La Tercera Fundación. Price seen on a back-cover scan.
- "The Game of Rat and Dragon" is presented anonymously and without a title other than the generic heading noted (according to Espaebook).
- The signed cover is a repainting of that used on the first Pyramid editions of Arthur C. Clarke's Against the Fall of Night.