This documentary takes a critical look at the diagnosis of Multiple Personality Disorder, the supposed coexistence of several distinct personalities within the same individual, and here through the story of a patient, Rachel Downing, a kind of modern-day Dr. Jekyll and Mr. Hyde. Over the past fifteen years, the United States has seen a growing number of cases, some 30,000 patients, most of whom undergo hypnosis. Psychiatrists generally attribute these disorders to abuse suffered in early childhood and in nearly all patient cases, it is recalled when under hypnosis. The film questions the relevance of the Multiple Personality Disorder diagnosis, which has spread with remarkable speed in the United States and parts of Europe, despite the lack of any scientific validation. It also invites us to reflect on the workings of memory.