Washington, mid-1960s. Mary, who has French roots, lives with her husband, a high-ranking CIA officer, and their three children in the residential district of Georgetown, where the couple rub shoulders with high society and the elite of the political world. Mary is a feminist and pacifist - classified by the FBI as a left-wing activist -, as well as a painter and she leads the life of an intellectual, keenly absorbing all the new experiences that are available to her in this pre-1968 period.
When her youngest child dies in an accident, Mary's life falls apart, she leaves her husband and she settles down on her own with her two remaining children. At this point, she bumps once again into a man whom she had known at college and her earlier passions are reignited. Mary agrees to remain the secret love of this man, whose public role prevents him from ever making their relationship official. And yet she is the one who plays an active role in the shadows, at his side.
Mary is modern in outlook, too much so in the opinion of some, and makes no secret of her desire to change the world. The man she loves so deeply dies in Dallas on 22 November 1963, and then she dies in her turn a year later, murdered on the banks of the Potomac, just two days before her 44th birthday. The journal she kept was never found. It is the journal of the true love of JFK.