Dead Again (1991) on Netflix

Mike Church is a Los Angeles private detective who specializes in finding missing persons. He takes on the case of a mystery woman whom he calls Grace. She is suffering from amnesia and has no memories of her own. She keeps having nightmares involving the murder of a pianist, Margaret, by her husband Roman Strauss in the late 1940s. In an attempt to solve the mystery about these nightmares, Church seeks the help of Madson who is an antiques dealer with the gift of hypnosis. The hypnosis sessions will soon begin to reveal some surprises.