John Buchan 
The Thirty-Nine Steps [EPUB ebook] 

Considered by many to be one of the greatest adventure novels of all time, 'The Thirty-Nine Steps’ is John Buchan’s most successful work. Set during the First World War, it is the story of Richard Hannay, an ordinary gentleman who finds himself mixed up in a plot to undermine the British war effort. A fugitive from the law, Hannay must race against time to try and stop the plot. 'The Thirty-Nine Steps’ is an exciting adventure of mystery and espionage that will thrill and delight readers both young and old.