The electroshocks have accentuated Marc/Philippe's hallucinations: he sees the car accident that killed his brother. Convinced of being the victim of a conspiracy, he escapes from the hospital and returns to the cottage of their childhood. The trauma comes back to him. Philippe was the favorite, and when he died in the accident, little Marc took his place, posing as his dead brother. He spent his whole life in the skin of the one he was jealous of. The shock makes him again switch to another reality, that of Philippe, the pianist. How do you know who he really is?

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.

A talented concert pianist, Philippe Kessler is about to give an important recital in Strasbourg. But more and more, around him, the sounds and images become distorted, as if parasitized by another reality. Why is he the only one to hear his piano go out of tune, his playing transformed into a funeral cacophony? As he withdraws, violently fighting his fear of madness, those close to him worry. On stage, the evening of the big premiere, he collapses, and wakes up in the skin of another.