Gah, I can't believe forgot Michael Crichton! He's my second favorite author, next to Tolkien. Jurassic Park is magnificent and The Lost World was a good follow up, Sphere is incredible, although extremely weird, Timeline is wonderful, Prey is extraordinary, and the Andromeda Strain is compelling. I'd recommend any of his books. He's one of the few authors that actually makes you believe what you're reading- in Jurassic Park he could've just said they cloned dinosaurs but he went through the process of explaining HOW they cloned dinosaurs, and made it very believable.