Sam and Sadie meet in a hospital in 1987. Playing together brings joy, escape, fierce competition - and a special friendship.

Then, all too soon, that time is over and they must return to their normal lives. When the pair spot each other eight years later in a crowded train station the spark is immediate, and together they get to work on what they love - creating virtual worlds to delight, challenge and immerse. Their collaborations make them global superstars but along with success, money and fame come betrayal and tragedy...