"The Conspirator" is a period drama based on true events following the assassination of President Lincoln. Wright Penn will play Mary Surratt, the only woman among a group charged with conspiring to kill the president. McAvoy will play Frederick Aiken, an idealistic young war hero who reluctantly defends Surratt and in the process comes to believe she is innocent.
Rachel Wood is said to be playing Wright Penn's daughter Anna Surratt, while Kebbell has been cast as the assassin John Wilkes Booth.