The hero of the novel “To Know a Woman” is a hunter of other people’s secrets. A supernatural instinct for lies makes him an invaluable agent of special services. However, after his wife’s death, he resigns to be with his daughter. Now he painfully looks into his own past, and a vague feeling doesn’t leave him—that life is a secret code that cannot be deciphered. In his book “To Know a Woman,” Amos Oz reveals, delicately like Strindberg, the very essence of marriage.