Three successful but bored friends in their mid-forties decide to turn to poaching. They are Sir Edward Leithen, lawyer, Tory Member of Parliament (MP), and ex-Attorney General; John Palliser-Yeates, banker and sportsman; and Charles, Earl of Lamancha, former adventurer and present Tory Cabinet Minister. Under the collective name of John Macnab, they set up in the Highland home of Sir Archie Roylance, a disabled war hero who wishes to be a Conservative MP.