"Letters to Castor" is in itself the great and unshakable proof of the tender, deep, and unique relationship that existed between the philosopher Jean-Paul Sartre and the great feminist author of "The Second Sex," Simone de Beauvoir.
Every letter that Jean-Paul Sartre addresses to his "adorable beaver," Simone, is filled with love, tenderness, respect, and irresistible confessional disposition. He couldn't think or do anything without mentioning it to Simone, his "little moral conscience" as he called her.

He adored this woman of "great solitary walks" and sought her forgiveness. "Will you forgive me, my sweet little one, I have behaved like a disturbed child. I have hurt you."
"Letters to Castor" are the everyday human moments and weaknesses, the mental ups and downs of a person - even when that person is a giant of thought like Jean-Paul Sartre. And yet, these letters reveal, through the confessions of the French philosopher, how unique and incomparable a woman Simone de Beauvoir was.