I just finished "A Simple Plan" by Scott Smith. It's not a new book (1993) and it was made into a movie, so folks may already be familiar with it. I cannot recommend it highly enough, so hard to put down, what will happen next, the choices, the implications - I was actually a bit stressed out reading it, but in a good way, because it certainly wasn't my life! For a plot synopsis, I'll just say it starts out with some guys finding a small crashed plane with a large quantity of money in it . . .
Earlier this year I read "The Ruins" by the same author. I thought it was great in a nihilistic, bleak, and horrific way. It was a horror novel so it did it's job and did it well. I find it interesting that he has not published any other novels, because he is so talented.