Celine Decoox

In a church in Douai, a body is found staged in a manner reminiscent of the great Inquisition trials of the region in the 15th century. Commander Clara Baudran is forced to team up with Lieutenant Jérôme Santerre, her childhood sweetheart. She thought he had become a priest, but 20 years later she finds him working as a cop and father to a teenager. Once she gets over the shock, she has no choice but to rely on him to help her solve this mysterious murder... even as investigators are faced with a new victim.

Astrid Nielsen works in the library of the judicial police. She has Asperger's syndrome. With an incredible memory, she excels at analyzing files of ongoing investigations. The district commander decides to use it to the fullest, entrusting her with very complex investigations which have remained unsolved to date.