Castle Gay by John Buchan is a gripping adventure novel blending political intrigue, espionage, and moral complexity.

Richard Hannay—now a Member of Parliament—becomes entangled in a dangerous conspiracy when he inherits Castle Gay, a remote Scottish estate with a mysterious past. As threats emerge from radical agitators and shadowy figures, Hannay must uncover a plot to destabilize the nation. With the help of allies like Sandy Arbuthnot, he navigates deception, hidden identities, and acts of sabotage.

Set against a backdrop of postwar tension, the novel explores duty, honor, and the unseen battles behind public order. A masterful blend of suspense and action, Castle Gay reaffirms Buchan’s skill in crafting intelligent, fast-paced thrillers rooted in loyalty and courage.