File 3. The year is 1909. The inhabitants of the London borough of Bermondsey live in the most adverse conditions. Poverty, disease, and serious crime are all a part of their everyday lives. In the third case in the gripping series The Secret Files of Sir Arthur Conan Doyle, the sharp-witted author encounters a traumatized orphan boy who insists that he escaped death by a hairbreadth in a dark cave. His body displays curious puncture marks. It is rumored that a horned creature—the Satan of Bermondsey—commits abominations in the streets at night. Did the boy almost fall prey to it? Sir Arthur Conan Doyle is on the track of a secret that will change his entire life.