The crash of a state-of-the-art airliner claims the lives of hundreds of people. Only the analysis of the black box can shed light on the causes of the disaster. The investigation is led by Mathieu, a talented and eccentric analyst with a unique sense of hearing. The further he goes in his investigation, the more suspicious circumstances he uncovers. But no one believes Matthieu. So maybe it’s all just a sophisticated trick of his mind?