Sherlock has returned to 221B and is back to his old habits, much to the joy of our favourite doctor. When one of his experiments goes awry, however, will he be able to protect those he cares about from... himself?

Sherlock Holmes was a loner and a freak, as far as others were concerned, even among the wizarding population, but when he meets John Watson and Hermione Granger, he can't help but think that perhaps there's hope for himself. But there isn't much time to dwell on that, as the Golden Trio becomes the Golden Five, and many other strange things happen in the Wizarding World.