The Thirty-Nine Steps is an adventure novel by the Scottish author John Buchan. It first appeared as a serial in Blackwood's Magazine in August and September 1915 before being published in book form in October that year by William Blackwood and Sons, Edinburgh.
It is the first of five novels featuring Richard Hannay, an all-action hero with a stiff upper lip and a miraculous knack for getting himself out of sticky situations.
The novel formed the basis for a number of film adaptations, notably: Alfred Hitchcock's 1935 version; a 1959 colour remake; a 1978 version which is perhaps most faithful to the novel; and a 2008 version for British television.