A drugged Sherlock enlists the help of his dearest brother.

Faced with the case of his career, Lestrade enlists Sherlock and John to help him take down a serial killer hunting prostitutes in Whitechapel. He calls himself Jack the Ripper. But Sherlock is fighting his drug demons, and John is hiding a dark secret. All three will be brought to breaking point.

Elizabeth Hayden is stabbed on her wedding night, alone in a locked room, with a knife can't be found. Sherlock, John and Lestrade have other problems, though. The vicious snowstorm stranding them all in a remote Yorkshire manor house is one of them. Sherlock is using drugs again, and that's another. And nobody's enjoying the mass outbreak of food poisoning...

What will it take for Sherlock to admit that maybe, just maybe, he really does have a problem with drugs? One shot.