After a defector is murdered, British agent Fielding Scott is assigned to track down a mole in his own ranks in 1961 Berlin. His investigation leads him into a deadly web of crime, betrayal and paranoia. Who can Scott trust in the city of spies?

This four-part docuseries showcases visionaries such as the Parker Brothers, Milton Bradley and Ruth Handler who transformed a small toy company into the billion-dollar empire now known as Mattel. It reveals the little-known stories behind groundbreaking innovations like the Frisbee® and accidental discoveries like how the Slinky was created.