Line of Duty series will focus on an unsolved murder case.AC-12 are brought in to investigate because there is suspicion over how it is being handled.There are set to be high-octane action sequences as well as the show’s trademark interview scenes.In fact, there is so much going on the series has been extended to make it the biggest yet with seven episodes.Martin Compston has teased the scripts are “superb as ever”.And he has revealed some storylines will reach a thrilling climax.He said: “One of the things I find exciting is that our favourite series to do was series three, because we were building to this big climax and it feels like we’re back at that point.“In some way the whole series has been building to this.”Last series we learned.
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