Nathan, 25 years old, is an idealist. He has a meeting with Daniel, his producer. His heart is pounding. There's something Daniel needs to tell him.

Paris, December. A conductor of a choir is found mysteriously murdered, with burst eardrums. Lionel Kasdan, a police inspertor the verge of retirement, and Frank Salek, an official of Interpol, embark together on a hunt for the killer, and also to a secret organization specializing in kidnapping children.