After Reichenbach the world didn't believe in Sherlock Holmes. John Watson did his best, but in the end he chose to move on: he got something half decent with a girl named Mary, and occasionally was asked for help by DI Lestrade. But now Sherlock's returned from the dead... and apparently Moriarty is too, but he's lost almost everything. So he asks the help of a most unlikely ally, an ally that might pull the stakes higher than ever for anyone... even for Sherlock Holmes.