In the early 1900s, a quiet young woman named Miss Beauchamp began to lose time. She woke in strange places, found letters in handwriting she didn’t recognize, and heard a voice inside her head that was not her own. Morton Prince, the physician who treated her, documented one of the most remarkable cases in the history of psychology — a woman whose personality had fragmented into several distinct selves, each with its own memories, preferences, and will. This modern reader’s edition of The Dissociation of a Personality preserves Prince’s groundbreaking clinical narrative while rendering its language clear and accessible for today’s audience. You will follow the discovery of the personalities, the bewildering interactions between them, and the slow process of reintegration. More than a historical curiosity, this book offers profound insights into the nature of self, memory, and trauma — questions that remain at the heart of psychological science. Part of The Modern Wisdom Library.