When Simone de Beauvoir was nine years old and attending the Catholic school "Antoine Desir", she met Elizabeth Lacouan, also known as Zaza, a girl who immediately caught her attention.
Between them, a friendship will develop that, from the perspective of the later great French writer, will also have the tone of early, unconscious, erotic desire.

In Zaza, de Beauvoir will discover all the elements that she will later desire to have in her own life: audacity, independence, curiosity, creative restlessness. Thus, this influence will prove decisive for her subsequent personality.

However, the Indissoluble hide a tragedy: Zaza dies unexpectedly. A catastrophe that will haunt de Beauvoir forever.
De Beauvoir is certain that Zaza did not die from viral encephalitis, as the doctors claimed. She was murdered; her death was a "spiritual crime".

More contemporary than ever, this classic novel has a special power and charm. As Simone de Beauvoir herself said: "And if, tonight, my eyes are filled with tears, is it because you have died or because I am alive? [...] I know that you are no longer anywhere and, precisely, through a literary artifice, I speak to you here".