The Mark of the Angels - Miserere

Retired Paris police chief Lionel Kasdan, the former head of a special kidnapping unit, has been called to investigate a strange murder: a choirmaster found dead in his church with his eardrums shattered and apparently no witnesses. Meanwhile, Frank Salek, an Interpol agent threatened with suspension due to his excessive behavior, is following a lead on a secret organization suspected of kidnapping children. When Salek hears about the choirmaster's murder, he suspects there's a link with his own case and agrees to team up with Kasdan. But the further the investigation leads them, the more Salek seems to lose his grip, as if a long-hidden secret were now catching up with him. Pretty soon the two men are tangled up in an affair that goes back to the darkest hours of WWII... (official distributor synopsis)