This is, as stated many times above, definitely the best Dean Koontz there is - and I've read them all!
The story takes you from the past to the future; it twists, turns, makes you shiver and touches you. Sounds like a lot of blabla, but I do not want to give anything away. Let's just say that the theme is : whoever tries to change the course of history will find that the world tries to go back to the fate that was decided for you in the first place. But imagine that you could go back, and change important world events....what if? Also, the love described in the book between Danny and Laura is amazing. Not in the sexual sense, though; it describes two true soulmates.
Great book. Do not hesitate: buy this!