After being assigned to investigate the aftermath of a catastrophic plane crash, an NTSB black box analyst uncovers chilling audio anomalies that no one else seems willing to acknowledge. As he digs deeper for the truth, he provokes powerful forces determined to silence him before he exposes a shocking conspiracy.

François Marsault, a war veteran, makes the most of his retirement alongside his wife Annie. Authoritarian and ruthless, François rules his family with an iron fist — but when he discovers that his esteemed wife cheated on him 40 years ago, he files for divorce and confronts her former lover, who lives in the French Riviera.

How did Sarah and Victor get along for more than 45 years? Who was this enigmatic woman living in the shadow of her husband? Love, ambition, betrayals and secrets feed the story of this extraordinary couple, as they experience both the large and small moments of the last century's history.

Spring reveals the secrets buried under the Sapenay pass, overlooking Lake Annecy. As the snow melts, a hiker discovers in a cave the body of a woman, killed by a bullet through the heart. Near this still anonymous victim, two other bodies, men, lie under the snow, frozen for years.