Céline and Julie Go Boating (1974) on Netflix

Plot summary

Julie, a librarian, sits in a park reading a book of spells when Céline, a stage magician, walks past dropping her possessions. Julie gathers them and trails her across Paris; the two women end up sharing an apartment, trading identities along the way, Céline posing as Julie for a meeting with Julie's childhood sweetheart while Julie takes Céline's place at a cabaret audition. Céline recognizes a walled mansion, 7 bis, rue du Nadir-aux-Pommes, as the house where she works as a nanny to two jealous sisters, a widower and a sickly child. Each visit ends with the woman ejected into Paris with no memory and a candy in her mouth; sucking the candy carries her back into the house's other reality, where a murder mystery plays out again and again.