I went to bed at about 10 PM last night - with the intent of reading a couple of chapters of Prey to wind down. I finished the book at 1:30 AM.
It's that kind of book. Crichton wrote Jurassic Park, and the flavor of the book is similar. Man messes with evolution. Man screws up. All hell breaks loose. Instead of dinosaurs though, this time it is a mix of nanotechnology, biotechnology, and evolution. I won't give any spoilers here. The thing about Prey is that it is all too real. Advances are being made in nanotechnology, biotech is making amazing strides, and we are still evolving. The scenario he lays out in the book seems all too possible in the near future. And that is scary.