Koontz mystery novels

I understand that Dean Koontz writes mysteries as well as horror stories. I have just begun Velocity which is very good so far. It was recommended as a mystery. Can anyone provide a list of his other mystery titles? I don't care for scifi or horror.

Most of Dean's books are unusual and not what you would really describe as horrors. The Odd Thomas series and his Frankenstein series are very good. My favoriate Dean Koontz is Relentless. He is my favorite author so I pretty much like everything that he writes. He has a quirky sense of humor and that makes his writings less spooky. His works are not at all like Steven King although I have heard them compared to each other.