It's about a man named Dexter, who is a blood-splatter analyst by day, and a sociopathic vigilante by night. One day, a murder occurs and there is no blood at the scene, which completely fascinates him. As the story progresses, the person responsible for the murder, known only as "The Ice Truck Killer" contacts him in various ways and leaves him clues that will bring him closer to finding out his identity. I believe there's an episode or two on myspace or youtube, if you're interested in watching it
