26 March (2017-03-26) – 30 April 2017 (2017-04-30)
Series chronology
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List of episodes
The fourth series of the British police procedural television programme Line of Duty was broadcast on BBC One between 26 March and 30 April 2017. It is the first series to air on the network after the first three were broadcast on BBC Two.
The series follows the fictional Anti-Corruption Unit 12. AC-12 is lead by Superintendent Ted Hastings (Adrian Dunbar) and by his team DS Steve Arnott (Martin Compston), DS Kate Fleming (Vicky McClure). They are also assisted by PC Maneet Bindra (Maya Sondhi) and DC Jamie Desford (Royce Pierreson), who is briefly assigned to the team. The unit investigates DCI Roz Huntley (Thandie Newton); she is suspected of arresting the wrong suspect after ignoring forensic evidence presented by Forensic Coordinator Tim Ifield (Jason Watkins). Over the course of the investigation she implicates her husband Nick (Lee Ingleby) and his lawyer Jimmy Lakewell (Patrick Baladi). Supporting characters include ACC Derek Hilton (Paul Higgins and DS Sam Railston (Aiysha Hart).
The series was commissioned along with the third after the success of the second. Line of Duty was created by Jed Mercurio who executive produces the series alongside Simon Heath and Stephen Wright. Cait Collins produced it. Filming took place in late 2016 with Mercurio directing two episodes and John Strickland directing four. Anna Valdez Hanks and Stephen Murphy provided cinematography. The series was nominated 21 awards of which six were won. It also received significantly higher viewing figures than previous series and mostly positive reviews from critics leading to the commissioning of series six. The fifth series returned to BBC One in 2019.
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