Aimee Leduc, a Parisian private investigator, has 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 old Jewish man approaches Aimee with a secret decoding job on behalf of a woman in his synagogue, Aimee unwittingly takes on more than she was expecting. When she takes her findings to her client's house in the Marais, Paris's historic Jewish quarter, she finds the old woman strangled, a swastika carved on her forehead. Can Aimee solve the crime?