Based on the novel "The Best of Enemies: Race and Redemption in the New South", the film starring Taraji P Henson follows her character of Ann Atwater, a civil rights activist, who battles KKK Leader CP Ellisafter, after they agree to co-chair a two-week community council to deal with a segregation decree in 1970's Durham, NC.
Mehner will play Maddy Mays, a key member of the council, reported Deadline.
The film also features Sam Rockwell, Anne Heche, Wes Bentley, Bruce McGill, Nick Searcy and John Gallagher Jr.