DCI Judas Iscariot of Scotland Yard's occult magic division, the Black Museum, has only been back in London for five minutes when things get bloody.

Bloody quickly.

Something evil has returned from the depths of the London Necropolis Burial Grounds. There's only one thing that its black heart desires ? the extermination of the Fae and the destruction of the magical underworld they inhabit.

The attacks begin, the death toll rises, and Judas quickly realises that the Fae and all the races of London's Under Folk are in danger. And with fairy pickpockets, Welsh tree spirits that love a good hustle, Dick Whittington's cat, angels and lots of friendly fire from a new threat to the Black Museum to contend with, he's far busier than he would like.

Then Lucifer the Morningstar, First of the Fallen, arrives unannounced; he knows something that Judas doesn't, and wants him to change sides as payment for spilling the beans.

Surrounded by enemies, always one step behind, and running out of time as usual, it's all looking a bit bleak for Judas.

But isn't it always?