Captain Jack Harkness is a man from the 51st century trapped in the past who leads the last remnants of the Torchwood Institute, a top secret British agency outside the government whose job it is to investigate alien goings on in the world, act in mankind's best interest, and, if needed, be the Earth's last line of defense.
Just because you're paranoid, it doesn't mean they're not out to get you. Conspiracy theorist Miles Mokri is shot on the very best day to be shot: Miracle Day. He doesn't die, but he is silenced, and his survivors are left only with cryptic clues he left behind. His sister Holly and friend Nick team up to decipher the clues and find out what Miles knew about a mysterious "Key," one of the secrets of Miracle Day.
During the frantic search for the Key, Holly, a cancer survivor, is faced with new enemies, betrayals, and mysterious references to something called "Torchwood." By the time she uncovers the Key, she's learned something about it that may change her mind about everything, including the Miracle itself.
A young man is shot in Los Angeles, but he doesn't die -- this is Miracle Day. When it's revealed that he knew the Miracle was coming, his sister, Holly Mokri, sets to work to figure out what he knew and why he was silenced. And back in 2007, Gwen Cooper saw Jack Harkness abducted in front of her -- what happened to him and how is it tied to the events in LA four years later?