A chance encounter in a curio shop with a man searching for his lost fiancée draws Sherlock Holmes into his strangest case to date. Almost one hundred people have gone missing from the streets of Highgate and mysterious "scavengers" are terrorizing the streets at night. When Holmes himself becomes the chief suspect in the kidnappings he is forced to seek shelter in the sewers among the criminal underground. And what is the mysterious evil lurking beneath Highgate Cemetery? Can Holmes uncover the truth when even his closest friends are being numbered among the missing?