The book is a classic thriller that follows the story of an unnamed British sportsman who embarks on a daring attempt to assassinate a European dictator prior to World War II. After being caught and tortured, he escapes back to England, but his ordeal is far from over. Pursued by enemy agents who want to finish the job they started, he must use his wits and survival skills to evade capture. The protagonist goes to ground in the English countryside, engaging in a deadly game of cat and mouse with his relentless pursuers, as he grapples with his own moral convictions and the consequences of his actions.