Rated of 5
Having just read this book made me curious to see other readers' comments, and no surprise, most of the reviews here and at Amazon.com, while lean, are positive (which "awesome" means, I think).
Koontz, well practiced and effective at crafting compelling yarns of this sort does yet another admirable job.
The characters here are in large part convincing, though the story drags towards the middle, plus some of the dialogue between the central character and his bestest buddy is thin (advocates of "awesome" see "lame"). One almost gets the sense that Dean had painted what he wanted, gotten bored with the composition, and was eager to get it over with, filling in the gaps in order to move on to his next project.
All that said, "Seize the Night" is not only engrossing entertainment but Dean Koontz at his best (meaning it isn't Blake or Melville, but then nor is it Stephen King, which is a good thing and about the highest praise any living writer in this genre could hope to have said about his work).
Overall? It's awesome. Dude.