DCI Roseanne Huntley is investigated by AC-12 as a seemingly corrupt police officer in the fourth series. Her case is part of the unit's broader efforts to uncover deep-rooted corruption within the fictional Central Police.
Their marriage becomes the emotional pressure point of Roz's corruption investigation.
Nick is identified as Roz's husband, is questioned by AC-12, and becomes increasingly suspicious of Roz's conduct.
Tim's forensic significance becomes part of the evidence undermining Roz's professional position.
Season 4 introduces forensic evidence that casts doubt over Tim Ifield while AC-12 investigates Operation Trapdoor and Roz's conduct.
Steve represents the anti-corruption investigation closing around Roz's professional and personal life.
AC-12 investigates Roz Huntley in Season 4, questions people connected to her, and remains convinced of her involvement.
Explore the full interactive character relationship map of Line of Duty