Episode 4: Written by Neil Cross / Directed by Nick Rowland/ showing on BBC1 and available on the BBC iPlayer
In which Richard Coyle joins that pantheon of memorable television killers with a string of incidents that have quite an impact on the drama and the characters within it. Following on from the third episode, Blackwood’s reign of terror spreads to the point where the case is taken out of police hands and becomes a counter terrorism issue. All the way through what is a slower but equally tense episode, Blackwood’s presence is felt even when he’s not there. Neil Cross masterminds some audacious acts of violence that, while the camera rarely lingers too long, still have the capacity to shock. You do wonder how a writer can think of such things.