DS Steve Arnott is arrested on suspicion of murder but continues to protest his innocence.

Loyalties are divided when DS Steve Arnott comes under scrutiny from his colleagues.

Fresh testimony launches AC-12 back on the trail of a corrupt officer.

DS Steve Arnott believes there is a dark secret in Danny Waldron's past.

After the shooting at the drugs house, DC Fleming increases the pressure on Danny Waldron.

Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal.