The 39 Steps. Poster of the 1935 movie and cover of the 1915 book, The Thirty-Nine Steps
VS3
The Thirty-Nine Steps
John Buchan, 1915
movie vs book
Alfred Hitchcock, 1935

At a London music hall theatre, Richard Hannay is watching a demonstration of the superlative powers of recall of Mr. Memory when shots are fired. When he sees police searching the train, he enters a compartment and starts kissing the sole occupant, Pamela, in a desperate attempt to escape detection.


Murder Is Easy. Poster of the 1982 movie and cover of the 1939 book
VS3
Murder Is Easy
Agatha Christie, 1939
movie vs book
Claude Whatham, 1982

Encountering a distressed elderly woman on a train, an American computer expert learns that a homicidal maniac is menacing her peaceful little village.