The year is 2000 and Joan Stanley is living in contented retirement in suburbia at the turn of the millennium. Her tranquil life is suddenly disrupted when she's arrested by MI5 and accused of providing intelligence to Communist Russia. Cut to 1938 where Joan is a Cambridge physics student who falls for young communist Leo Galich and through him, begins to see the world in a new light. Working at a top-secret nuclear research facility during WWII, Joan comes to the realisation that the world is on the brink of mutually assured destruction. Confronted with an impossible question - what price would you pay for peace? - Joan must choose between betraying her country and loved ones or saving them.
Trevor Nunn has developed an important career in the world of theatre, where he was director of the Royal Shakespeare Company and of the Royal National Theatre. His work in the field has earned him several Tony Awards for Best Director. For the big screen he has directed Hedda (1975), landing an Academy Award nomination for its protagonist, Glenda Jackson, Lady Jane (1986) and Twelfth Night or What You Will (1996), with which he competed in the Official Selection at San Sebastian.