The Repairman Jack series of fiction books by F. Paul Wilson are a good read. The level of violence can be shocking at times so be warned. The character has a very strong sense of what is right and what is wrong.
Repairman Jack website:
http://www.repairmanjack.com/forum/cont ... ed-fiction
Here's a link to a free ebook: The Last Rakosh - http://www.smashwords.com/books/view/15264
so you can try before you buy. I have not read this one yet.
If you enjoy reading Dean Koontz then you'll probably like F. Paul Wilson's books.