In the Jewish quarter of Paris an old nightmare is reborn.

Aimee Leduc, a half-American, half-French investigator 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 of the city.

When she does so, she finds a corpse on whose forehead a swastika has been carved. With the help of her partner Rene, a dwarf with extraordinary computer skills, she sets out to solve this horrible crime and finds herself caught up in a dangerous game with links to both modern politics and crimes from the Second World War.