Following the events of the last season, Sherlock and Joan work at repairing their partnership and, in so doing, discover a side to it which neither of them had anticipated. Whilst trying to come to terms with the true nature of their relationship, they find themselves embroiled in a case involving a ruthless killer, whose sights become fixed on Joan Watson. (Dedicated to RP&AW)

He had always been there, waiting for her. Both of them knew he always would, even if they did not speak of it. She had always been there, though often running late. It was a fact both of them knew, but never sought an explanation to. It was because of this they split up in the end; both of them knew that they would be together again, no matter what.