The stuff of nightmares

It's the autumn of 1890, and a spate of bombings has hit London.

Sherlock Holmes believes Professor Moriarty is behind the campaign of terror, but to what end?

At the same time, a bizarrely garbed figure has been spotted on the rooftops of the capital.

Known only by the name Baron Cauchemar, he appears to be a scourge of crime and villainy.

But is he truly the force for good that he seems?