At the outset of WWI, high-end thief Willa Forsythe is hired to steal a cypher from famous violinist Lukas De Wilde. Given the value of his father's work as a cryptologist, Lukas fears for his family and doesn't know who to trust. He likes Willa--and the feeling is mutual--but if Willa doesn't betray him as ordered, her own family will pay the price.