The third portrays his "dark passenger' as a living entity inside him, which I hated and a plot I couldn't buy. When I had a chance to read the fourth, Dexter by Design, I did so ready to bail the book quickly if it didn't catch on with me quickly.
"After his surprisingly glorious honeymoon in Paris, life is almost normal for Dexter Morgan. Married life seems to agree with him: he’s devoted to his bride, his stomach is full, and his homicidal hobbies are nicely under control. But old habits die hard—and Dexter’s work as a blood spatter analyst never fails to offer new temptations that appeal to his offbeat sense of justice…and his Dark Passenger still waits to hunt with him in the moonlight. The discovery of a corpse (artfully displayed as a sunbather relaxing on a Miami beach chair) naturally piques Dexter’s curiosity and Miami’s finest realize they’ve got a terrifying new serial killer on the loose. And Dexter, of course, is back in business."
The book had a pretty good plot which kept me interested, although I though the end was dumb. If you have read the first two and enjoyed them, you may enjoy this one too. Warning though, stay away from the third, Dexter in the Dark.