Spy Pocket Puzzle Book: 100s of Perplexing Puzzles for Starters, Astute Codebreakers and Britain's Best Minds (the Puzzle Series)
Spy Pocket Puzzle Book: 100s of Perplexing Puzzles for Starters, Astute Codebreakers and Britain's Best Minds (the Puzzle Series).
Published by How2become Ltd, (2017), Paperback, 180 pages.