Summer 2018, Los Angeles. Sébastien Tellier, 43, returns to the studio to record his new album, which is scheduled for release next year. The artist is at a turning point in his career: after the success of his disc Sexuality, ten years ago, he chained disappointments and exits from the media roads, to the point of boring even his most loyal fans. His new album will be the last chance. Between two rehearsals, he goes to a clinic in Los Angeles, where he will undergo a brain scan. We dive, with him, into the ramifications of his tortured mind, in search of the truth about one of the greatest mysteries of contemporary French music: the Tellier case.