Matthieu is a young and talented black box analyst on a mission to solve the reason behind the deadly crash of a brand new aircraft. Yet, when the case is closed by authorities, Matthieu cannot help but sense there is something wrong with the evidence. As he listens to the tracks again, he starts detecting some seriously disturbing details. Could the tape have been modified? Going against his boss' orders, Matthieu begins his own rogue investigation - an obsessional and dangerous quest for truth that will quickly threaten far more than his career...

Victor, a disillusioned sexagenarian, sees his life turned upside down on the day when Antoine, a brilliant entrepreneur, offers him a new kind of attraction: mixing theatrical artifices and historical reconstruction, this company offers his clients a chance to dive back into the era of their choice. Victor then chose to relive the most memorable week of his life: the one where, 40 years earlier, he met the great love.

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.