Polina, 40, suffers from anterograde amnesia, which forces her to re-learn every day that her daughter Taya is missing. But the mother refuses to believe in the worst outcome and, despite her illness, conducts her own investigation, reconstructing the events of what happened with the help of a diary. Polina increasingly suspects that Tai's disappearance is not an accident, and her family is hiding the truth from her.
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