Secret Obsession

Jennifer, a newlywed woman, is brutally attacked by an unknown assailant at a remote rest stop in the rain. She survives and wakes in a hospital with no memory of the attack or any part of her prior life. A man named Russell Williams (played by Mike Vogel) appears at her bedside, presenting himself as her husband and gradually reintroducing her to an identity: her parents died in a fire two years earlier, she had quit her job, and she had drifted away from her friends, leaving her effectively alone in the world. Once discharged, he takes her to their secluded mountain home to recover. Meanwhile, Detective Frank Page (Dennis Haysbert) investigates the case; he is personally driven by the unresolved disappearance of his own daughter years earlier and suspects that Jennifer's situation may be connected to a predatory pattern. Back at the house, Jennifer begins noticing small but disturbing inconsistencies — photographs that appear to have been manipulated, doors that are locked from the outside at night trapping her inside, and gaps in the narrative Russell tells that do not quite hold together. As Page digs deeper, the truth emerges: the man calling himself Russell is actually Ryan Gaerity, a former co-worker of Jennifer's who had nursed a silent obsession with her. When her real husband, the actual Russell Williams, married her instead, Ryan murdered him, staged Jennifer's attack, and exploited her amnesia to install himself in her life as her husband. Jennifer discovers her real husband's body hidden in a car trunk on the property, confirming that Ryan is both her captor and her would-be killer. Ryan pursues her into the surrounding forest intending to silence her permanently. Detective Page, having pieced together Ryan's identity and the murder, arrives at the estate in time to intervene. In the violent confrontation, Jennifer shoots Ryan — first wounding him, then fatally — ending his obsession. Three months later, Jennifer is shown driving toward San Jose, emotionally scarred but alive, listening to a final love note written by her real husband that Detective Page had recovered during his investigation.

Sources: Wikipedia, IMDb, Web search (multiple outlets)