With good Sherlock gone, the series has lots its brilliantly antagonistic focus. It was a nervy move, though - how can anyone now oppose bad Sherlock? Even a new good Sherlock has to play catch-up, though he has some help from amoral Sherlock. This new tripartite arrangement can't replicate the intimacy of the original mind-games, so it's just as well we're left with one more volume to wrap things up. Surely Kira is headed for a downfall and the only question is how it comes about?