This is probably the best of the Prime Suspect series. The script is strong, Helen Mirren is at the top of her game, and she's supported by some of the best character actors around--Ciaran Hinds, David Thewlis and Tom Bell, especially. The confrontation between Mirren and Hinds at the end is an acting tour de force. The two of them together are just magic. This is a very, very dark story, but it's not cynical and hopeless like Prime Suspect 5. Tennison does win in the end, if only on points, and the message seems to be that Good can triumph, if only a hero is willing to sacrifice enough. In this case, Tennison's sacrifice might have been her very soul.