In 1945, on the outskirts of Salzburg, American soldiers discover a train filled with unspeakable riches: gold watches and wedding rings, picture frames and Shabbat candlesticks. Jack Wiseman is the lieutenant tasked with guarding this treasure in the chaotic aftermath of war—a responsibility that grows more complicated when he meets Ilona, a fierce, beautiful Hungarian woman who has lost everything in the ravages of the Holocaust.

Seventy years later, amid the shadowy world of art dealers who profit off the sins of previous generations, Jack gives a necklace to his granddaughter, Natalie, and charges her with returning it to its owner. And as Natalie searches for the woman whose portrait and unknown fate have come to haunt her, she will come to understand the secret her grandfather took to his grave.