Really good British drama theat keeps you interested right up to the last minutesof the last episode. I'd give in a 7/10, but if it wasn't for a very obvious character that served little purpose in the story other than to be the sinister bad guy I'd have given it a 10/10.

The charcter 'Bobby" was obviously written into the story to be the obligatory bad guy, but everything about him and his inclusion in the plot is full of holes so big you could drive a truck through. For example (spoiler alert)
[spoiler] 1) What did the girl and boy hope to acheve by confronting him? there were other they could have confronted on theirown doorstep.
2) How did Bobby manage to drive onto the 'secure estate' with complete impunity and exit during a crisis and the cops don't even know a thing about it?
3) After parking his car and walking unseen to the house - where was all the fire-starter explosive devices? In his pockets?
4) Killing was obviously easy for him... why kidnap the girl and then only decide to kill her when the cop chick shows up? Why not kill her in the fire with the other woman?
5) How would he have cleaned up the girls brains after shooting her - in his apartment?
6) How the hell did he actually kidnap the girl? He'd have to drag her through the nosey neighbourhood to his car and then drive off the estate. [/spoiler]