It's based on the novel Darkly Dreaming Dexter and it's captivating.
I discovered Dexter last week, they were rerunning all of Season 1 in anticipation of Season 2 returning on the weekend. I've been watching 2 or 3 episodes a day, getting caught up.
A few of my favourite lines from the first six episodes:
"People fake a lot of human interactions, but I feel like I fake them all, and I fake them very well, that's my burden, I guess."
"Needless to say I have some unusual habits, yet all these socially acceptable people can't wait to pick up hammers and smash their food to bits. Normal people are so hostile."
"There's something strange and disarming about looking at a homicide scene in the daylight of Miami. It makes the most grotesque killings look staged, like you're in a new and daring section of Disney World: Dahmerland."