Charlotte von Kirschbaum and Karl Barth is the first concentrated study of the collaboration of the towering theologian Karl Barth and his secretary and theological assistant for more than three decades, Charlotte von Kirschbaum. Barth always maintained that he could not have produced his theological oeuvre without her. Von Kirschbaum was also his constant companion. Discussion of the two has long been aswirl in rumor and speculation, with regard both to their personal relationship and to von Kirschbaum’s part in Barth's theological achievement.

Drawing upon published and unpublished sources that include their own writings, the observations of contemporaries, and correspondence with people who knew them, Suzanne Selinger seeks to describe the collaboration in a multidimensional way. Von Kirschbaum gave a series of lectures in 1949, published in the same year, on women in the perspective of Scripture, theology, and the church. In the three volumes of Barth's Church Dogmatics that deal with humankind, including the male-female relationship as the locus of the image of God, Barth cites von Kirschbaum's scholarship. The subject inevitably reflects upon their own relationship. Moreover, it is just this subject―the anthropology of gender―that has been the source of the categorical rejection of Barth by many feminists.

The author―a Barthian, a feminist, and a trained historian―addresses the concerns of Barth's critics by agreeing deeply with them in part but also by insisting upon understanding Barth and von Kirschbaum contextually. This means biographically and in relation to early German feminism (a phenomenon little known in the English-speaking world), the intellectual movement known as dialogical personalism, and the background of everything Barth and von Kirschbaum wrote or thought in their work together: the steady, threatening growth of the Nazi state, World War II, and the postwar German situation.