AC-12 investigate the suspicious actions of a unit of armed police officers and their leader Sgt Danny Waldron (Daniel Mays). Third series of the BAFTA-nominated crime drama.
As suspicions grow around a police shooting, Fleming is sent undercover to investigate Sgt Danny Waldron's armed unit.
While AC-12 launch an investigation into who shot Waldron, Arnott is forced to defend his professional conduct in court.
While Fleming trails Hari Bains, Arnott investigates the dark secrets hidden in Waldron's past.
AC-12 restart their hunt for 'The Caddy', while Denton works her way back into Arnott's life and Cottan tries to tie up loose ends.
While Arnott continues to work with Denton, Pressure begins to build as Cottan attempts to discredit him within AC-12.
As evidence begins to mount against Arnott, Fleming attempts to persuade Hastings to pursue a new line of inquiry.