John Buchan 
Thirty-Nine Steps [EPUB ebook] 

John Buchan, 1st Baron Tweedsmuir; 26 August 1875 – 11 February 1940) was a Scottish novelist, historian and Unionist politician who served as Governor General of Canada, the 15th since Canadian Confederation. John Buchan wrote The Thirty-Nine Steps while he was ill in bed with a duodenal ulcer, an illness which remained with him all his life. The novel was his first "shocker", as he called it – a story combining personal and political dramas. The novel marked a turning point in Buchan’s literary career and introduced his famous adventuring hero, Richard Hannay. He described a "shocker" as an adventure where the events in the story are unlikely and the reader is only just able to believe that they really happened. (Excerpt from Wikipedia)