Sam and Sadie meet in a hospital in 1987. Playing together brings joy, escape, fierce competition - and a special friendship. 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. Together they get to work on what they love - creating virtual worlds to delight, challenge and immerse. But with success, money and fame come betrayal and tragedy...