The end of the nineteenth century. It all begins with an encrypted telegram received by Sherlock Holmes from his brother—an eccentric counterintelligence officer, Mycroft. This time, even Queen Victoria herself is under threat, and Holmes, together with Dr. Watson, hurries north to the Scottish castle of Hollyrood—the very place where three centuries ago Queen Mary Stuart’s secretary, the Italian David Rizzio, was brutally murdered.
But the dangers ahead will make even the ghost of the Hound of the Baskervilles turn pale. Mad Scottish nationalists preparing explosions, mutilated bodies with not a single intact bone, a pool of blood that never dries, and worst of all—a disembodied voice of the murdered Italian, sounding from the dark…