Variety reports that Keira Knightley is in talks to join the film in an unspecified role, giving the film a starpower boost that was sorely needed as Cumberbatch is still an unproven draw. Based on Andrew Hodges' novel Alan Turing: The Enigma, the story will follow the famed mathematician, cryptanalyst, and computer scientist whose study of algorithms and code-breaking skills were pivotal to the Allies in WWII. His work led to the creation of the Turing Machine, a pre-cursor to the modern day computer. All of his successes didn't stop him from being criminally prosecuted as a homosexual, and with his personal and professional life ruined, he would commit suicide in 1954.
Knightly will be seen later this year opposite Chris Pine in Jack Ryan, and has John Carney's music-industry drama Can A Song Save Your Life?