Filme: 39 Steps (2008)
"Richard Hannay, a mining engineer on holiday from the African colonies, finds London socialite life terribly dull. Yet it's more then he bargained for when secret agent, Scudder, bursts into his room and entrusts him a coded notebook with map, concerning the impending start of World War I. In no time both German agents and the British law are chasing him, ruthlessly coveting the Roman numerals code, which Hannay believes he must crack himself. Masquerading as a liberal party pundit, Richard also gets stuck with parliamentary candidate Sir George Sinclair's sister Victoria. They must survive with the secrets and decide who they can trust and how to keep it from others." (retirado de imdb.com)
Alfred Hitchcock adaptou o livro de John Buchan ao cinema em 1935, e em 2011 foi considerado pela Total Filme a 2ª melhor adaptação de livros a filmes.
Recentemente, em 2008, a BBC tentou adaptar o livro colocando a acção nas vésperas da II Guerra Mundial, e não se deu mal. Vale a pena ver.