The fourth series sees AC-12 facing their most devious opponent yet! Under pressure from her superiors, DCI Roz Huntley charges a young man with a series of murders after months of fruitless investigation, but is he guilty? The Chief Forensic Investigator has doubts and turns to AC-12.

Episodes of this season

Thandiwe Newton
DCI Roz Huntley

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Martin Compston
DS Steve Arnott

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Vicky McClure
DC Kate Fleming

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Adrian Dunbar
SI Ted Hastings

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Jason Watkins
Tim Ifield

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Paul Higgins
ACC Derek Hilton

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Lee Ingleby
Nick Huntley

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Gaite Jansen
Hana

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Claudia Jessie
DC Jodie Taylor

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Royce Pierreson
DC Jamie Desford

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Patrick Baladi
Jimmy Lakewell

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Mark Stobbart
DS Neil Twyler

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Maya Sondhi
PC Maneet Bindra

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Anneika Rose
Farida

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