Torchwood are forced underground, as the government takes swift and brutal action. With members of the team being hunted down, only Lois holds the key to Torchwood's salvation - but she is helpless as her superiors make plans for the mysterious Floor 13.

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