The French philosopher Paul Eichmann, famous and controversial author of "The theory of superimposed worlds", died on August 8, 2018 at the age of forty years old. The philosophy of “modal realism,” propounded by David Kellogg Lewis, stipulates that all possible worlds are real in the same way as the actual world. This idea lies at the heart of Antoni Collot’s beguiling and beautifully mystifying film about a young man who visits the partner of his father, the recently deceased philosopher Paul Eichmann. The partner, Brune, lives with their three-year-old daughter, Madeleine. The daughter’s Proustian name is a key to the film’s time-traveling style, as the story takes a series of inexplicable turns, including the reappearance the the late philosopher. Exquisitely made, the film is as emotionally engaging as it is intellectually adventurous.