I second, Lightening by Dean Koontz...it is my all time favorite book ever!! I have read it like over 10 times. I love most of his books, but that one is the one that sealed the deal for him being my favorite author ever!! His Odd Thomas series is good...I also enjoyed his series on the story of Frankenstein continued. also, Life Expectancy, Dark River of the Heart, and Watchers.
I like series so,
Robert Crais: (Elvis Cole series that turns into the Joe Pike series),
Michael Connolly (Harry Bosch series),
John Sandford (Lucas Davenport series that morphs into the Virgil Flowers series),
Faye Kellerman (Peter Deker series) and her husband
John Kellerman (Can't think of the characters name).
Janet Evonovitch (Stephanie Plum series...it is so funny I laugh out loud while reading them, bugs my husband).
J.A.Jance has two series and a bunch of stand alone books they are all good.
Sue Grafton (A is for Alibi, B is for...series)
The Woods by Harlen Coben...really good mystery.
Patricia Cornwell (series and stand alones)
Kathy Riechs (Temperance Brennan series)
Oh oh oh...one of my all time favorite scary books that everyone should read...In Cold Blood by Truman Capote.
Okay enough of my mystery loving self...nothing deep or spiritual in my reading just mystery fiction. Good luck!!