Read Fahrenheit 451 by Ray Bradbury - it's a classic, it's a deep and thought-provoking book but one that is also entertaining and filled with wicked awesomeness!

Other than that, I can recommend the Crichton books, preferably the Andromeda Strain, State of Fear and Next. Crichton was probably the most badass politician/lobbyist/author the world has ever known!

And, last but not least, I found Stephen King's "Cell" (aka "Pulse") to be one hell of a scary book. The ending is lame, but other than that the book is fantastic - great storytelling, mystery, plot-twists and all that. Seriously a great read!