A young woman, Jill, returns home to find that her sister Molly has disappeared, eerily similar to her own abduction a year prior, from which she managed to escape. Convinced the kidnapper has returned for her sister, she finds her claims dismissed by the police, who doubt her story and question her mental health, given the lack of evidence and her previous mental breakdown. Frustrated and determined, Jill decides to take matters into her own hands to save her sister.

Embarking on a frantic search across the city, Jill meticulously retraces her steps from her previous ordeal, using her memory and any clues she can find to track down the kidnapper. Along the way, she encounters obstacles and skepticism from those she seeks help from, making her mission increasingly solitary and desperate. She leverages every piece of knowledge about her abductor, risking her own life in the process, to uncover his identity and rescue her sister before it's too late, driven by the fear of losing the only family she has left.