In the summer of 1956, 23-year-old Colin Clark (Eddie Redmayne of LES MISÉRABLES ) joined the set of THE PRINCE AND THE SHOWGIRL as an assistant determined to make his way up in the film business. His diary, released 40 years later, documented the tense interactions between Sir Lawrence Olivier (Kenneth Branagh of JACK RYAN, VALKYRIE) and the iconic Marilyn Monroe (Michelle Williams of BLUE VALENTINE, BROKEBACK MOUNTAIN). But a week was missing from that account, and this is the story of that time—an experience Clark will never forget. As he and Marilyn get closer, she begins to shake off the insecurity that plagues her and exposes the many complex layers that have fascinated the world since her rise to fame.