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.