Each new series of BBC procedural series Line of Duty focuses on a fresh anti-corruption investigation placing the spotlight on a new suspected character.
Mercurio is also working on Bodyguard, a new BBC series about a volatile war veteran.
Upon its debut in 2012, Line of Duty – created by Jed Mercurio – became BBC Two’s most-watched original drama in ten years.
The channel handed it a further two series following a critically successful second run – with another two commissioned to air on BBC One.