Grant is part of a special London police unit. Full-time cop and part-time wizard, he works on rather unusual crimes - those that involve magic and the general weirdness that permeates London's dark underbelly. His latest case begins with a perfectly innocent car on a homicidal killing spree - without a driver. But then, before you know it, there's a Bosnian refugee, the Most Haunted Car in England, a bunch of teenagers loaded on Ketamine, and a seemingly-harmless...

CSI meets Harry Potter in this fantastic new graphic novel from Ben Aaronovitch, writer of the bestselling Rivers of London supernatural police procedural crime novel series! Something dark and slimy is dripping through the walls of suburban London. Not the usual stuff that smells funny and can be hell on the lungs, this mould is possessed by some dark power full of bad intentions. Looks like it's another case for London's one and only trainee wizard...