Based on the novel by Evelyn Piper, Bunny Lake is Missing is a mystery following the disappearance of 3-year-old Bunny Lake, who has vanished without a trace during her first day of school. Her mother is frantic, but no one seems to remember having seen the little girl in the first place. As the search intensifies, questions arise as to what might have happened to little Bunny and whether she ever really existed in the first place.