A mysterious figure whose actions ignite the protagonist's journey. Known for his encoded notebook and quick-change disguises, Scudder possesses a strong but complicated moral code.

A German spy organization represented by a trio of men with distinct appearances. They relentlessly pursue Hannay while adeptly blending into various settings.

A young, spectacled man encountered by Hannay at an inn, who is characterized by his love for literature, especially Milton's works. He aids Hannay through a shared sense of adventure and skepticism toward normalcy.

A young political candidate who nearly collides with Hannay, offering assistance in the form of hospitality and a critical introduction to Sir Walter. Often seen as naïve but well-meaning, he becomes a valuable ally.

A wild-looking Scottish roadman with thick spectacles, who shows kindness to Hannay by offering him refuge and recovery. His straightforward and trusting nature reflects anti-establishment sentiments.

A privileged young man who serves as comedic relief and a character foil to Hannay through his encounters, initially forced to assist Hannay and later attempting to thwart him.

The permanent secretary to the Foreign Office, providing a bridge between government bureaucracy and the spy world. He enhances Hannay's efforts with his experience and resources, symbolizing British authority and competence.