Toshiko falls for a handsome soldier, trapped out of his time, who unwittingly holds the key to saving the world. With an old hospital haunted by ghosts from 1918, a crisis foreseen by Torchwood 90 years ago is about to reach its climax. Time zones are colliding and with life and death decisions to be made, will Torchwood be able to stop an explosive end for Cardiff?

When Adam, an alien with the power to change memories infiltrates the team, the entire dynamic of The Hub shifts. With Captain Jack caught up in memories of his lost family, Gwen struggling to remember Rhys, and Ianto convinced that he's a murderer... it costs the entire team dearly to rid themselves of Adam's influence.