May 1914.
Britain is on the eve of war with Germany. Richard Hannay is living a quiet life in London, but after a chance encounter with a mysterious stranger he stumbles into a hair-raising adventure - a desperate hunt across the country and against the clock, pursued by the police and a cunning, ruthless enemy.

Hannay's life and the security of Britain are in grave peril, and everything rests on the solution to a baffling enigma: what are the thirty-nine steps?