In 1906, Sheriff John Le Brun of Jekyl Island arrives in London where he is introduced to the institution of the "men's club." With hundreds of such clubs in London alone, these clubs are where men of certain specialized interests meet, often wielding great power behind closed doors. In the company of his new acquaintance, Sir Arthur Conan Doyle, Le Brun visits the Sceptred Isle Club where he is to give a talk. But shortly after they arrive, they hear a number of muffled shots. A quick investigation reveals that several prominent men have been murdered in the normally locked gambling room - with no survivors and no sign of the culprit. Now, rubbing elbows with the famous and the infamous of the time, the task of solving the puzzle falls to Le Brun. For behind these seemingly senseless, nearly impossible murders, lie a truth and a purpose with far-ranging implications for the entire British Empire.