1940. As Soviet forces storm Lithuania, Zofia and her brother Jacek must flee to survive. A lifeline appears when Japanese consul Sugihara offers them visas on one condition: they must deliver a parcel to Tokyo. Inside lies intelligence on Nazi atrocities, evidence so explosive that Nazi and Soviet agents will stop at nothing to possess it. Pursued across Siberia on the Trans-Siberian Express, Zofia faces danger at every turn, racing to expose the truth as Japan edges close