DAY BEFORE YESTERDAY follows the story of a woman suffering from total memory loss. Found unconscious in the middle of the downtown Montreal strip, she was brought in by police who proceed to interview her. Does she remember who she is and where she came from? Can anyone else remember?

We are carried through the story by the woman’s haunting voice-over narration as she describes the utter loneliness she experiences, until a visit from someone who claims to know her sheds unexpected light on the woman — and her past.