| Author | John le Carré |
| Publisher Series | Libro Amigo |
| Imprint | Bruguera |
| Translated by | Carlos Casas |
| Publisher | Editorial Bruguera, S.A. |
| Copyright Holder | Le Carré Productions, Editorial Noguer, S. A. |
| Cover/Jacket Design by | Neslé Soulé |
| Printed by | Editorial Bruguera, S.A. |
| Series | Karla Trilogy, George Smiley |
| Format | Pocket book |
| Language | Spanish |
| Location | Spain |
| Copyright | 1974 |
| Price | 200 PTAS. |
| Notes | Printed in Spain Edición original: © Le Carré productions - 1974 (Original Edition: © Le Carré productions - 1974) Primera edición en lengua castellana: © Editorial Noguer, S. A. - 1974 (First published in Spanish: © Editorial Noguer, S. A. - 1974) |