On a winter day in 1953, a mysterious man in a sheepskin coat stood out to Harriet Pattison, then a theater student at Yale; she would later learn he was the architect Louis Kahn (1901-74). This chance encounter served as preamble to a 15-year romance, with Pattison becoming the architect's closest confidante, his intellectual partner, and the mother of his son. This book weaves together Pattison's own story with letters, postcards, drawings, and photographs that reveal Kahn's inner life and his architectural thought process, including insight into some of his greatest works.