I have been a fan of the DEXTER series on Showtime since it's debut. I decided to read the novel that it is based on, DARKLY DREAMING DEXTER by Jeff Lindsay. I really wish I had read the novel first, because I would have been blown away by it. The Showtime series, at least season one, stayed pretty true to the novel, with a few exceptions that I won't go into so as not to spoil it for anyone.
The best thing about DDD is Lindsay's writing style. It is a first person POV and as much as I enjoy the TV narration, it comes across so much better in the novel. JL has a talent and wit that translates into many laughs during the course of the novel.
I will start on the next DEXTER novel, when time permits.
Overall, If you have not seen the Showtime series, you are in for a great ride with DDD. Even if you have, it is still a worthwhile read. Like a lot of novels, DDD does require that you suspend your belief system just a bit, but it's fiction and it very entertaining.