The actress is slated to team up with Boardwalk Empire star Jack Huston for the film, which is scheduled to begin shooting in West Virginia in May (16), according to moviehole.net.

The thriller centres upon a rookie FBI agent and the informant he falls in love with while investigating the drug underworld in rural Kentucky.

Clarke is in final negotiations to play the well-connected informant, who seduces the agent and falls pregnant with his child.

Both stars have a high-profile 2016 ahead of them - Clarke is preparing for the new season of Game of Thrones, while Huston will lead the cast of the Ben-Hur remake, which hits cinemas in August (16).