Murder in the Marais — Cara Black

Aimee Leduc, the half-French, half-American detective in Paris, is approached by a rabbi to decipher a fifty-year-old encrypted photograph and deliver it to an old woman in the Marais, the old Jewish quarter. When she does so, she finds a corpse on whose forehead a swastika has been carved. With the help of her partner, a dwarf with extraordinary computer skills, she sets out to solve this horrendous crime and finds herself in the middle of a dangerous game of current politics and old war crimes.