One night in April 1933. For unexplained reasons, a young couple commits suicide in their Paris apartment. Before that, they had gone dancing, met two women and two men, and ended up in a building with a red elevator. Three decades later, on a sultry August day, a man sits in a Paris café and reflects on this story, in which - it seems - companions from his own life were also involved. He embarks on a quest to trace those people, uncovering unexpected connections and swapped realities. During his wanderings through Paris, the narrator perceives silhouettes, encounters, names. He is searching for evidence and clues to convince himself of the existence of these past acquaintances and locations.