Before Sherlock Holmes became the world's greatest detective, he was a soldier. A spy. A hunter in the shadows.

Fresh from the battlefields of empire, Captain Sherlock Holmes serves in Her Majesty's military intelligence-where death is rarely found on the battlefield, but in whispered betrayals, coded messages, and the gloved hands of unseen enemies. When a decorated British officer is murdered under impossible circumstances, Holmes and his loyal companion, Dr. John Watson, are drawn into a web of espionage that stretches from the gaslit streets of London to the farthest reaches of the empire.

At the center of it all stands a man known only as Moriarty-a phantom who manipulates nations like pieces on a chessboard.

To stop him, Holmes must outwit a faceless enemy, navigate a treacherous world of double agents, and confront a truth more dangerous than he ever imagined.

Because in this war, the greatest threat to the empire... may come from within.