As a nun, Katharina von Bora lives the life destined for her until she comes into contact with a completely new world of thought in the early 20s through the writings of Martin Luther. She flees with some of her co-sisters and comes without legal status, without income and rejected by her family to Wittenberg, where she meets Martin Luther personally. Katharina decides to marry the reformer and, as his wife, becomes a respected housekeeper, an equal interlocutor and the mother of their children ...