The Broken (2007)

Synopsis
A woman is thrust into a world where everything is subtly unfamiliar in this edgy thriller from writer and director Sean Ellis. Gina McVay (Lena Headey) is a radiologist who is enjoying dinner one evening with her family and her boyfriend Stefan (Melvil Poupaud) when a mirror shatters for no apparent reason. After a few moments, no one thinks much of it, but the next day Gina is leaving work and she sees something even more troubling -- a woman who looks just like her, driving a car identical to her own. Curious, Gina sneaks into the doppelganger's apartment and sees a photo of herself and her father in the hallway. Seriously rattled, Gina runs out and drives away, only to get in an accident that lands her in the hospital. After she's released, Gina asks Stefan if she can stay with him, but while he looks the same, his personality and behavior are quite different from the way she remembers him, and she begins having vivid nightmares which become all the more terrifying when the same horrific images begin popping up in her waking hours. The Broken received its American premiere at the 2008 Sundance Film Festival. ~ Mark Deming, All Movie Guide