A detailed account of a case study of someone too divided within herself. In the treatment, lasting over 20 years, 'Susan' suddenly and spontaneously discovered the capacity to do doodle drawings. It was partly for this reason and also in order to clarify, both for herself and for others, what she was learning from her patients that Marion Milner wrote the book. But the ultimate stimulus came from the drawings themselves, with their deep unconscious perception of the nature of the battle between sanity and madness.