Stark was a callow young magician who loved his girlfriend and had a few daddy issues. Then he got betrayed by his buddies and cast into Hell. Alive. There he spent eleven years getting tortured in unspeakable ways while killing monsters and demons in an arena to amuse other monsters and demons, all to survive a little longer. Now he's back on earth, has a few anger management issues, and wants revenge, in part for being betrayed and in part for his murdered love. While he's getting his revenge he earns a buck freelancing as a monster killer for an angel and as a bodyguard for Lucifer when he's on earth. The only side Stark is on is his own.
These are nice light books in their own blood-and-unspeakable-gunk-soaked way. The books are a very fast read. I also enjoyed book three, Aloha from Hell: A Sandman Slim Novel. I hope there's a fourth book in the works!