Lux Radio 37/12/13 (ep154) The 39 Steps (Robert Montgomery, Ida Lupino)

Plot
At a London music hall theatre, Richard Hannay is watching "Mr. Memory" demonstrate his powers of recall when gunshots are heard. In the ensuing panic, Hannay finds himself holding a seemingly frightened woman who persuades him to take her back to his flat. She tells him her name is Annabella Smith, she is a spy and she fired the shots to create a diversion so she could elude assassins. She claims that she has uncovered a plot to steal vital British military information, masterminded by a man missing the top joint of one finger. She mentions "The 39 Steps", but does not explain the phrase.

Later that night, Smith bursts into Hannay's bedroom and warns him to flee, before dying from a knife in her back. Hannay finds a map of the Scottish Highlands clutched in her hand, showing the area around Killin, with a building named "Alt-na-Shellach" circled. He sneaks out of his flat disguised as a milkman to avoid the waiting assassins. He then boards the Flying Scotsman express train to Scotland. At Waverley Station in Edinburgh, he learns he is the target of a nationwide manhunt for Smith's murderer. When he sees police searching the train, he goes to another compartment and kisses the sole occupant, Pamela, to try to avoid capture; however, she alerts the policemen, who stop the train on the Forth Bridge. Hannay escapes.