9.5/10 2,735 votes#1 - Episode 6
Season 3 Episode 6 - Aired 4/28/2016
DS Steve Arnott is arrested on suspicion of murder but continues to protest his innocence.
Director: John Strickland
Writer: Jed Mercurio
9.1/10 1,600 votes#2 - Episode 5
Season 3 Episode 5 - Aired 4/21/2016
Loyalties are divided when DS Steve Arnott comes under scrutiny from his colleagues.
Director: John Strickland
Writer: Jed Mercurio
9.0/10 1,513 votes#3 - Episode 6
Season 4 Episode 6 - Aired 4/30/2017
While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.
Director: John Strickland
Writer: Jed Mercurio
9.0/10 1,491 votes#4 - Episode 4
Season 6 Episode 4 - Aired 4/11/2021
DCI Jo Davidson faces increasing pressure from all sides as AC-12 make major breakthroughs in the investigation, but an attempt to interview a key witness goes horribly wrong.
Director: Gareth Bryn
Writer: Jed Mercurio
8.9/10 1,358 votes#5 - Episode 4
Season 5 Episode 4 - Aired 4/21/2019
Tensions rise in the OCG following the events at Eastfield. With troubling questions hanging over the identity of ‘H', suspicions mount at AC-12.
Director: John Strickland
Writer: Jed Mercurio
8.9/10 1,374 votes#6 - Episode 5
Season 6 Episode 5 - Aired 4/18/2021
AC-12 link Gail Vella’s murder with a historic case of police corruption, and Kate hatches a plan to tell once and for all if Jo is bent. They are closer than ever to cracking the case, but when Hastings’ authority is undermined it leaves his team in a potentially dangerous situation.
Director: Jennie Darnell
Writer: Jed Mercurio
8.7/10 1,310 votes#7 - Episode 5
Season 2 Episode 5 - Aired 3/12/2014
Lindsay fights for her life as troubling details emerge of a vicious conspiracy involving corrupt police officers. With growing evidence of links between DCC Dryden and the ambush, Hastings is under pressure to arrest his senior officer.
Director: Daniel Nettheim
Writer: Jed Mercurio
8.6/10 1,538 votes#8 - Episode 1
Season 3 Episode 1 - Aired 3/24/2016
Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal.
Director: Michael Keillor
Writer: Jed Mercurio
8.6/10 1,318 votes#9 - Episode 3
Season 4 Episode 3 - Aired 4/9/2017
As AC-12 wrestle with the new forensic evidence casting doubt over Tim Ifield, Kate is approached by another woman claiming to have been assaulted by Michael Farmer.
Director: John Strickland
Writer: Jed Mercurio
8.5/10 1,579 votes#10 - Episode 1
Season 2 Episode 1 - Aired 2/12/2014
A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turn their spotlight on Lindsay Denton, the officer who led the convoy but escaped unscathed.
Director: Douglas Mackinnon
Writer: Jed Mercurio
8.5/10 1,384 votes#11 - Episode 2
Season 2 Episode 2 - Aired 2/19/2014
Following the tragedy at the hospital, AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit. But Lindsay in turn gathers compromising evidence against the anti-corruption team.
Director: Douglas Mackinnon
Writer: Jed Mercurio
8.5/10 1,262 votes#12 - Episode 4
Season 4 Episode 4 - Aired 4/16/2017
Roz's husband Nick is brought in for questioning by AC-12. But while Nick denies any involvement in Steve's attack, his suspicions about Roz mount.
Director: John Strickland
Writer: Jed Mercurio
8.5/10 1,220 votes#13 - Episode 5
Season 4 Episode 5 - Aired 4/23/2017
DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.
Director: John Strickland
Writer: Jed Mercurio
8.5/10 1,473 votes#14 - Episode 1
Season 5 Episode 1 - Aired 3/31/2019
Following the deadly hijack of a police convoy, AC-12 target a ruthless organised crime group known to have links with corrupt officers.
Director: John Strickland
Writer: Jed Mercurio
8.5/10 1,237 votes#15 - Episode 2
Season 5 Episode 2 - Aired 4/7/2019
Kate and Steve attempt to track down a lead. A fresh police leak enables another audacious raid, while Steve’s attempts to gather information put him in a dangerous situation.
Director: John Strickland
Writer: Jed Mercurio
8.5/10 1,161 votes#16 - Episode 5
Season 5 Episode 5 - Aired 4/28/2019
As the hunt for 'H' intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.
Director: Susan Tully
Writer: Jed Mercurio
8.4/10 1,293 votes#17 - Episode 4
Season 2 Episode 4 - Aired 3/5/2014
Following the violent attack she suffered in prison, Lindsay is granted special dispensation to visit her dying mother. Meanwhile, deputy chief constable Dryden shrugs off allegations about his relationship with Lindsay and possible links to the ambush.
Director: Daniel Nettheim
Writer: Jed Mercurio
8.4/10 1,276 votes#18 - Episode 3
Season 3 Episode 3 - Aired 4/7/2016
DS Steve Arnott believes there is a dark secret in Danny Waldron's past.
Director: Michael Keillor
Writer: Jed Mercurio
8.4/10 1,282 votes#19 - Episode 4
Season 3 Episode 4 - Aired 4/14/2016
Fresh testimony launches AC-12 back on the trail of a corrupt officer.
Director: John Strickland
Writer: Jed Mercurio
8.4/10 1,464 votes#20 - Episode 1
Season 4 Episode 1 - Aired 3/26/2017
DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation.
Director: Jed Mercurio
Writer: Jed Mercurio
8.4/10 1,194 votes#21 - Episode 3
Season 5 Episode 3 - Aired 4/14/2019
Corbett's most daring plan yet requires McQueen to exploit links with corrupt police officers.
Director: John Strickland
Writer: Jed Mercurio
8.4/10 1,385 votes#22 - Episode 6
Season 5 Episode 6 - Aired 5/5/2019
In a nail-biting 90-minute finale, Hastings's secrets are laid bare. Will 'H' be revealed at last?
Director: Susan Tully
Writer: Jed Mercurio
8.3/10 1,622 votes#23 - Episode 5
Season 1 Episode 5 - Aired 7/24/2012
With Gates on the run, the anti-corruption team come under pressure to close the case once and for all. Arnott is forced to make some tough decisions about where his loyalties lie. Fleming and Hastings go all out to catch Gates, leading to a shattering conclusion.
Director: Douglas Mackinnon
Writer: Jed Mercurio
8.3/10 1,298 votes#24 - Episode 2
Season 3 Episode 2 - Aired 3/31/2016
After the shooting at the drugs house, DC Fleming increases the pressure on Danny Waldron.
Director: Michael Keillor
Writer: Jed Mercurio
8.3/10 1,105 votes#25 - Episode 3
Season 6 Episode 3 - Aired 4/4/2021
On the strength of evidence from a new witness, DCI Jo Davidson brings Terry Boyle back in for questioning about Gail Vella's murder. Kate is torn between loyalty to Jo and wanting to assist AC-12's investigation, and tensions increase when Kate encounters a face from the past with links to organised crime.
Director: Gareth Bryn
Writer: Jed Mercurio
Top Episode Ratings Summary
The best episode of "Line of Duty" is "Episode 6", rated 9.5/10 from 2735 user votes. It was directed by John Strickland and written by Jed Mercurio. "Episode 6" aired on 4/28/2016 and is rated 0.4 point(s) higher than the second highest rated, "Episode 5".