On Christmas morning Kitty Doherty gives birth to her baby - who is immediately taken away for adoption in America. But Kitty's life is hanging by a thread, her only hope a dangerous journey through snow to Ballymara and her Irish family. Meanwhile, in Chicago, Sean and Alice try to set up a new life, far away from the families they have deserted in Liverpool.
The first message sent to Tom Thorne's phone was just a picture - the blurred image of a man's face, but Thorne had seen enough dead bodies to know that the man was no longer alive. But who was he? Who sent the photograph? And why? While the technical experts attempt to trace the sender, Thorne searches the bulletins for a reported death that matches the photograph. Then another picture arrives.