There are no spoilers to give away in Cracker: A New Terror as far as the plot is concerned; we are in on it from the start. What there is to watch is a tautly written and magnificently acted crime show with little gore, minimal violence, and not about strange mysterious forces out to destroy our wonderful way of life. This is a very human drama, about a severely troubled individual who was damaged by an act of unspeakable inhumanity.
If you're looking for a message in Cracker: A New Terror I would say it was you don't heal from that type of damage by inflicting it upon others, it only makes it worse and increases the chances of other people reacting in the same way. That's a message we could all do with learning, don't you think?
The DVD includes the usual making of special feature, but this one is a little more detailed as it does give you a good history of the series right from the start. Interview subjects include Robbie Coltrane, the writer, and the director. It's a widescreen edition and comes with the option of 5.1 surround sound, which in this case helps because of the unusual amount of background sound.