The Long Earth is open. Humanity now spreads across untold worlds linked by fleets of airships encouraging exploration, trade and culture. But while mankind may be shaping the Long Earth, the Long Earth is, in turn, shaping mankind - and a collision of crises is looming. More than a million steps from our original Datum Earth a new America has emerged - a young nation that resents answering to the Datum government. And the trolls - those graceful, hive-mind humanoids whose song once suffused the Long Earth - are, in the face of man's inexorable advance, beginning to fall silent... and to disappear. It was Joshua Valiente who, with the omniscient being known as Lobsang, first explored these multiple worlds all those years ago. And it is to Joshua that the Long Earth now turns for help. Because there is the very real threat of war ... ... a war unlike any fought before.