The 39 Steps — Pauline Francis

In this retelling for younger readers, Richard Hannay is a Canadian visitor to 1930's London. After a disturbance at a music hall, he meets Annabella Smith, who is on the run from foreign agents. He takes her back to his apartment, but they are followed, and later that night Annabella is murdered. Hannay then goes on the run to break the spy ring and to prove his innocence.