Line of duty Series 4 Ep6

Nick Huntley is interviewed regarding his movements on the night of Ifield's murder. AC-12 realise it is consistent with the few CCTV recordings and witness testimonies they have, but struggle to find any evidence to implicate DCI Huntley. Desford is transferred to Hilton's team and is in conflict with AC-12. DCI Huntley leads them to her husband's jumper, which allows Polk Avenue to formally charge him with Ifield's murder, as well as the previous crimes attributed to 'Balaclava Man'. Nick Huntley asks Lakewell to get AC-12 involved, but he does not. DCI Huntley asks Taylor to secretly analyse some telecoms. Arnott realises Ifield's killer stole a tracksuit, because his or her clothes would have been covered in blood, and then would have changed clothes again when they got home before hiding both. They narrow their search to a three-hour window shortly after Ifield's murder, and are able to spot DCI Huntley driving towards a large woodland area. They discover the MRSA that infected DCI Huntley's wound is likely to be traceable to Ifield. Arnott works out that the time taken for DCI Huntley to drive to and from the area would have only given her a few minutes to hide the evidence. They find that she had previously led a search of the area and that she had hidden her own incriminating evidence in the same place.
DCI Huntley is subsequently arrested for Ifield's murder and requests Lakewell as her solicitor. After being interrogated and facing damning evidence against her, DCI Huntley admits to Ifield's accidental death in self-defence and to framing her husband. Just as the interview appears to be concluding, DCI Huntley arrests Lakewell for perverting the course of justice. It is revealed that Lakewell, whom Nick Huntley rang as Arnott was approaching his office, used a burner phone to tip off Hilton, who then contacted the man who attacked Arnott. The burner phone was also used by the man who kidnapped Hana, planted the evidence in the house of Michael Farmer, and attacked Arnott. Lakewell had attempted to frame Farmer, on the orders of the people running a scheme to get vulnerable police staff to manipulate evidence so that they can be pressured later. DCI Huntley proves Hilton's involvement through the number he gave her while attempting to seduce her. Hastings and Fleming head to Hilton's office, but Desford has tipped him off, and he has left by the time they arrive. Desford attempts to leave with Lakewell, but Arnott and DCI Huntley stop him, saying he has probably been set up to be murdered. Hastings and Fleming return but one of the balaclava men (Lakewell admits there are many) holds a security guard at gunpoint. Hastings promptly shoots him. When they get upstairs, Desford has pulled a gun on Arnott. However, Huntley is able to persuade him to surrender it. Hilton is found dead the next day, his death is ruled a suicide, but took place at the same location as a murder relating to the Sands View child molestation ring. Hastings, seemingly no closer to untangling the bigger conspiracy, admits he thinks this has become a lifetime's job. The biometric data of the dead balaclava man is revealed to match the data from photographs and footprint of the balaclava suspect.
The epilogue reveals DCI Huntley was sentenced to ten years for Ifield's manslaughter and the subsequent cover-up. She and Nick remain married. Lakewell pleaded guilty to perverting the course of justice, but declined witness protection and refused to testify. Farmer was released without charge, and the Regulation 15 order against Hastings was dropped. Hastings remains in charge of AC-12.