For three years, Sherlock Holmes was officially considered dead. Not even Dr. Watson, his closest confidant, knew that the master detective had merely faked his supposed fatal fall at Reichenbach. Now he is back and is helping Scotland Yard capture a copycat of Jack the Ripper when his brother Mycroft asks for his assistance. In a remote Irish coastal town, a horrifying plague is spreading: all the inhabitants are gradually going insane and turning into bloodthirsty cannibals. Sherlock is now to investigate a terrifying suspicion. Is it possible that a nefarious crime lies behind this epidemic? The 'Sherlock Holmes Society' marks a turning point in the career of the king of deduction. Not only is he once again operating in public, but he is also more aware than ever before of what he must confront.