Tall, handsome & debonair, John Mannering (Steve Forrest) is a man who knows the world and thrives on adventure through his business as an international art and antique dealer. It's a business that stirs greed, vanity and passions that propel him into exciting, danger-laden adventures stemming from the wares he handles and the people who buy, sell or steal precious treasures. To add to the excitement, THE BARON also assists British Intelligence, aided by the glamorous Cordelia (Sue Lloyd) as they risk their lives on espionage missions for the head of Diplomatic Intelligence, John Alexander Templeton-Green (Colin Gordon).