If you like The Rivers of London series, The Netherweird Chronicles, Crow Investigations, The King's Watch, The Dresden Files, and The Vinyl Detectives, then this is for you. Fourth Seal and Lamb of Mayfair are the Landlords from Hell. They invest in bricks and mortar to crush bones and fill mortuaries, and they prefer the rent to be paid in blood and misery. It is only when Florence Snoutsville, a reporter for the Underworld's most-read daily, The Newgate Calendar, investigates the disappearance of a family of Fae that the true extent of Fourth Seal and Lamb's evil plan is discovered. D.C.I., Judas Iscariot of Scotland Yard's secret occult magic division, The Black Museum, is called in to stop them. Cursed with immortality by an angry and vengeful God, it's his job to protect London's Fae and the legion of fantastic and unusual creatures that make the Underworld beneath the Underground their home. But Judas has more than enough of his own demons to face. There are traitors in his midst; he's surrounded by enemies, old and new, duplicitous witches with dubious intent, shadowy angels with secret agendas, and rumours of fiery metal beasts running the rails deep below the surface. He's more alone than ever before. So, will this be the End of Days for Judas, or can he finally earn his way into Heaven