Armie Hammer and Mads Mikkelsen are set to star in Amma Asante’s The Billion Dollar Spy, which is based on the true story of how one Soviet Engineer and his CIA handler risked their lives to help bring an end to the Cold War. Hammer will play Brad Reid, who has just arrived at the CIA's Moscow station when he’s approached by Soviet engineer Adolf Tolkachev (Mikkelsen). Ignoring the advice from his bosses that Tolkachev is an obvious KGB ‘dangle’, Reid develops a bond and a unique friendship with the Russian, who seemingly only wants to help …