It is a year after the death of Sherlock Holmes when Watson again sets pen to paper to record another of his sensational investigations, a series of events so scandalous they could not be related earlier, as told in Anthony Horowitz’ The House of Silk.
When Edmund Carstairs believes he and his family are being threatened by a man in a flat cap, he turns to Holmes for help. It appears that the man has followed him from America seeking revenge. The pursuer’s murder does not solve the puzzle, but instead leads Holmes and Watson ever deeper into a dangerous London underworld of opium dens and worse with links to the most powerful and influential levels of British society. In this dark world, they hear whispers about the House of Silk. But inquiries lead to threats, and they are warned off the investigation in no uncertain terms by those in the highest levels of government. Soon Holmes finds himself in prison, accused of murder.