The Broken (2008)

In London, radiologist Gina McVey organizes a surprise birthday party for her father John McVey with her boyfriend Stefan Chambers, her brother Daniel McVey, and his girlfriend Kate Coleman. The next day, she sees herself driving a car on the street and she follows the woman to her apartment, where she finds a picture of her and her father. While driving back, she has a car crash and loses parts of her memory; further, she believes Stefan is another man. Gina decides to investigate what is happening and unravels a dark reality.