The story of the complex relationship between two world leaders during one of the greatest crises in human history.

Born just two weeks apart in 1874, Winston Churchill and William Lyon Mackenzie King had much in common. Both forged long parliamentary careers, and each led his country to victory in World War II. A BBC poll deemed Winston Churchill the greatest Briton of all time, and Mackenzie King has been judged by a group of historians as the greatest Canadian prime minister. Their parallel careers fostered a working relationship that lasted almost fifty years. It was not...