Sandman Slim

This book had me picturing a twisted mashup of Constantine, Sin City, and a really fun, dark, and surreal movie called Cemetary Man aka Dellamorte Dellamore (Starring Rupert Everett)
http://www.imdb.com/title/tt0109592/?ref_=fn_al_tt_1

Still, demons and magic all wrapped up in a Noir version of L.A. ... yea it was a fun ride.