Moriarty's ugly mug plastered across every device in England is enough of a threat that Mycroft recalls Sherlock who, mere minutes into his exile, finds himself back in where he started. The threat to Sherlock, John, and Mary is dire, but the threat to everyone else is even greater.

Sometimes it takes a certain kind of catalyst to trigger a chain reaction. Whether that catalyst is a beautiful woman or skin-warmed scotch, who is to say? Though there is a third party present here, this story is really all about our favorite Baker Street Boys and how they might have discovered what we all already know exists ;)