The acting was very good, but the plot is so unbelievable. No police officer in the UK would be allowed out in a patrol car alone, so everything from the start is unbelievable. He is troubled by the constant phone calls, even if police officers were allowed to take their personal phones out on duty (which I doubt) why doesn't he turn it off. ÑO can't believe the story line at all. Pity because the acting was very good. Come on BBC, don't take your viewers for fools.