Coming to the assistance of a nanny who is almost killed during a bungled hit-and-run assassination attempt, Richard Hannay (More) is surprised to find that there is no baby in her pram. Curious, he meets her at the Palace Music Hall where she has gone to see the act of Mr Memory (James Hayter (actor)). Afterwards, she goes back to Hannay's flat with him, where she reveals that she is a spy working for British Intelligence following a group called "The Thirty-Nine Steps"; all they know about their elusive leader is that he is missing the tip of a finger. The Thirty-Nine Steps are in possession of a set of top-secret plans for "Boomerang", a British ballistic missile project that could tip the balance of power in Europe. She tells Hannay that she must leave for Scotland immediately, but while Hannay is out of the room, she is killed by two hitmen.