On a delayed train, deep in the English countryside, two strangers meet. It is 1942 and they are both men of fighting age. As strangers do, they pass the time by sharing their stories. But walls have ears and careless talk costs lives...At Bletchley Park, Honey Deschamps spends her days transcribing decrypted signals from the German Army. One night, as she walks home in the blackout, she meets a stranger who has a package for her. The parcel, containing a small piece of amber, postmarked from Russia and branded with two censor's stamps, is the first of several. Someone is trying to get a message to her. Can Honey uncover who is sending these mysterious packages and why before it's too late?