A few months ago, Ida vanished without a trace. When she neither returns nor her corpse is found, her father has a strange idea: he retreats with Ida's partner, Sander, into a spacious empty apartment for a talk that is part interrogation, part psychotherapy session, part confession. The story Sander has to offer is an eerie one, almost a ghost tale, that of a young couple withdrawing from all outside human contact.