Aimee Leduc has always sworn she would stick to tech investigation--no criminal cases for her. Especially since her father, the late police detective, was killed in the line of duty. But when an elderly Jewish man approaches Aimee with a top-secret decoding job on behalf of a woman in his synagogue, Aimee unwittingly takes on more than she is expecting. She drops off her findings at her client's house in the Marais, Paris's historic Jewish quarter, and finds the woman...