John Watson was already fighting demons when he and Sherlock met. With Sherlock's suicide, it all comes flooding back, forcing Sherlock to intervene before he's solved the persistent riddles of Jim Moriarty and his game. Together they find that something darker lurks behind Moriarty, forcing Sherlock, John, and Irene Adler into an even deadlier game with a much more dangerous foe. Begins six months after the events of The Reichenbach Fall.