With the beast came the murders. With the murders came the fear. It stalks the foggy streets, dark alleys, and deserted quays. It glowers in the dark corners of public houses. And it bides patiently at cold hearthsides. Some claim it to be none other than Black Shuck, the legendary harbinger of ill-fortune and death. Consulting detective Sherlock Holmes has his own hypothesis, believing the murders to be the work of a monomaniac—a madman with a singular and deadly obsession. But when he and Dr. Watson witness what seems to be the impossible, they enlist the aid of occult detective Thomas Carnacki. Together they pursue the beast through the town’s dark streets and surrounding woods. But even with their skills combined, how can they hope to fight an entity able to possess the minds and bodies of the very people they’re trying to protect? A tale of mystery, horror, and adventure from the lost files of Dr. John H. Watson.