1949. The Cold War is tightening its grip, spies lurk in every shadow, and the race for the atomic bombis turning deadly. When GCHQ operative Beattie Cavendish is sent to a remote listening station in the Scottish Highlands, she finds its commander missing, the mission compromised, and whispers of a German spy ring. Then matters take a darker and more personal turn when her uncle vanishes from nearby, leaving behind a chilling note: I know who you really are. With private detective Patrick Corrigan, Beattie must uncover the truth before snow and secrecy close in. For here, betrayal runs deep - and no one is who they seem.