Publisher: Hutchinson & Co, London;
Date of Publication: 1933
Stock Code: 6394
Undated, presumed FIRST EDITION. Octavo, pp 190, . Grids for completion by the amateur cryptographer for each chapter. Original pink cloth with black titles to spine in unclipped dust-jacket. Cover cloth lightly soiled & rubbed. Leaves toned as usual; ownership inscription dated 1943 to ffep;16 pages annotated with workings-out, some in ink. Jacket lightly surface soiled and nicked & creased to edge with minor loss.
A Code and Cipher Puzzle Book containing 25 stories, each with a secret message for the reader to solve. Major Yardley was a senior code-breaker during the Great War and an expert in the field.