When all the children in the world suddenly stop in their tracks and in unison chant the phrase 'We are coming', the Torchwood team know they have an alien force to reckon with, but how is the government involved?

Torchwood are forced into hiding underground to avoid the government squad's action against them and their families. Meanwhile, the government makes plans for the mysterious Floor 13.

The eyes of the world turn to Britain as the 456 announce they are there; a pillar of fire descends upon London and the members of Torchwood must battle to protect their own families when the fight gets personal.

Torchwood finally learns the truth about the events of 1965. Britain is in danger of becoming a rogue state and everything pivots around John Frobisher. The Ambassador of the 456 destroys its old allegiances and reveals its true intent.

Torchwood is defenseless and Gwen Cooper stands alone as the final sanction begins. As violence erupts and the world descends into anarchy, an ordinary council estate becomes a battleground, where the future of the human race will be decided.