The Courier, also known as The British Liaison, is a gripping true story about an English businessman who aided MI6 in infiltrating the Soviet Union's nuclear program during the Cold War. Wynne and his Soviet source, Oleg Penkovsky (code-named Ironbark), provided crucial intelligence that ultimately helped resolve the Cuban Missile Crisis. It's a thrilling tale of espionage and international intrigue that showcases the bravery and sacrifice of those who risked everything for the greater good.