Line of Duty has teased fans with a new trailer ahead of the season six premiere on BBC One on Sunday, 21 March.
The action-packed trailer sees Superintendent Ted Hastings (Adrian Dunbar) tell his team: "It will be our job to detect whether police corruption has contributed to this murder remaining unsolved."
"When did we stop caring about honesty and integrity?" he later asks.
In true Line of Duty tradition, there's a great cliffhanger at the end of the promo...
Season six of the Jed Mercurio-created series will have seven episodes - one more than usual.
It will also see the Line of Duty debuts of Kelly Macdonald as Detective Chief Inspector Joanne Davidson and Shalom Brune-Franklin as new AC-12 member Chloe Bishop.