Set during the 1962 World's Fair in Seattle, Century 21 takes place as the world hurtles towards the Cuban Missile Crisis. As America and the Soviet Union make their public and private moves, much of the world is unaware how close the brink of war has come. Against this background, Michael York starts his first day of work at the fair. Drawn to its idealised view of the future, he becomes attuned to the dual sides of life. With the World of Tomorrow on one horizon and nuclear war on the other, the stakes are high. Introduced to a mysterious array of colleagues, each with their own secrets, Michael investigates the fair with new friends. Drawn closer into the group, he uncovers a plot that will tip the balance forever.