I am reading Dearly Devoted Dexter right now, the second book in the series. I am about 10 pages from being done and I think there is only 1 more book in the series. So I guess it is more of a trilogy........
Anyway, they are the books that the show Dexter is based off of. They are really good and an easy read, which means I can read a couple pages and fall asleep with it and not get totally confused when I pick it up again.