Dr. Martin Harris (Liam Neeson) went to Berlin to participate in an academic exchange, but unfortunately encountered a car accident. After waking up in a coma, he found that his entire life had been stolen, his wife Elizabeth (January Jones) no longer knows him, and another person (Aidan Quinn) takes his place and becomes Dr. Harris, appearing openly at the academic conference. It seems that everyone thinks that he is the real Dr. Harris, which confuses Martin. No one believed Martin's story, the local police station in Berlin turned a deaf ear to his complaints, and it seemed that someone was starting to kill him. In a foreign country, we have no relatives and are in danger. Are people's memories stolen? Or is there something wrong with your head? Or is there a shocking conspiracy behind it? When Martin is desperate, a mysterious woman, Gina (Diane Kruger), appears and seems to help him find the truth...