In 1945, American soldiers discover a train filled with unspeakable riches. Jack is the lieutenant tasked with guarding this treasure —a responsibility that grows more complicated when he meets a fierce, beautiful Hungarian woman who has lost everything. Years later, Jack gives a necklace to his granddaughter, Natalie, and charges her with returning it to its owner. As she searches for the unknown woman, she will come to understand the secret Jack took to his grave.