The Thirty-Nine Steps

A South African engineer visiting London, Richard Hannay gets caught up in an intricate spy plot when a British secret agent takes shelter in his accommodations. When the spy is killed by a secret organization, Hannay becomes its next target, and must flee to Scotland, where he may be able to uncover the mystery by locating a black book. Aided by the lovely Alex Mackenzie, Hannay figures out the organization's sinister scheme and attempts to halt it.