Philippe Kessler opens his eyes to a reality that is not his. Here he becomes Marc, his twin brother killed in a car accident when they were children. Married with one child, his new "me" is subject to violent bouts of schizophrenia. Trying to find his old identity, Marc/Philippe discovers that a look-alike has taken his place at his piano and with the one who was his wife, and that their DNA is identical. In the cemetery, his brother's grave has disappeared. Forced to accept this irrefutable proof, he submits to confinement in a psychiatric hospital, with electroshock treatment.