Mel Gibson has agreed to star in Edge of Darkness, reports Variety. The actor will portray “a straitlaced police investigator whose activist daughter is killed. He plunges into the case and uncovers systemic corruption that led to his daughter’s death.” Darkness will be directed by Martin Campbell, who also directed the 1985 BBC miniseries upon which the film is based. William Monahan penned the project’s screenplay. Graham King will produce Darkness through his GK Films banner, with Michael Wearing also producing.