BBC Radio 4 Extra Book at beachtime. Joan's voice is almost a whisper. ' Nobody talked about what they did during the war. We all knew we weren't allowed to.' Joan Stanley has a secret. She is a loving mother a doting grandmother & leads a quiet unremarkable life in the suburbs. Then one morning there is a knock on the door & suddenly the past she has been so keen to hide for the last fifty years threatens to overturn her comfortable world. Cambridge University in 1937 is awash with ideas & idealists yet unworldly Joan feels better suited to a science lecture & a cup of cocoa. But a chance meeting with the glamorous Russian-born Sonya & her charismatic cousin Leo blurs the edges of the things Joan thought she knew about the world & about herself. In the post-War world of smoke & mirrors allegiance is a slippery thing. Working in a government ministry with access to top-secret information Joan is suddenly faced with the most difficult question of all: what price would you pay to remain true to what you believe? Would you betray your country your family even the man you love?