Which 1935 Hitchcock thriller follows Richard Hannay after a murder in London?

The 1935 Hitchcock thriller following Richard Hannay after a London murder is The 39 Steps.

Robert Donat plays Hannay, a Canadian civilian who becomes entangled in an international espionage plot after meeting Annabella Smith at a London music hall. Smith claims that spies are stealing British military secrets, but she is later murdered in Hannay’s flat, leaving him wrongly suspected and forced to flee.

The film sends Hannay from London into the Scottish Highlands, where he tries to clear his name and stop the spy organization called The 39 Steps. Madeleine Carroll plays Pamela, a woman who initially doubts Hannay but becomes involved in his escape. The story blends chase thriller, comedy, romance, and mistaken-identity elements.

Hitchcock adapted the film loosely from John Buchan’s 1915 novel The Thirty-Nine Steps. The movie is not a literal adaptation: its characters, incidents, and tone differ substantially from the book. Hitchcock also makes one of his signature brief appearances, visible near the beginning of the film.