Gwen Cooper once lived the ultimate double life – the funny, salty, earthy woman who loves home and family, combined with the tough, ruthless warrior, who loves the thrill of the fight. She was the heart and soul of an organization called Torchwood. She was a defender of the human race. But now she lives in seclusion, with her devoted husband Rhys and baby Anwen, knowing that one day trouble will come calling again. When events surrounding "Miracle Day" push Gwen to the limit, she'll need to call on resources she never knew she had and make the most terrible decisions, on behalf of all mankind.