Tell no one

8 years ago fell Margot Beck victim for a serial killer. Her husband Alexandre is totally absorbed in the painful memories and his job as a doctor. When the police discovers two bodies and a bloody bat close to the site where they found Margot, they re-open the case, and alaxandre becomes the main suspects for 3 murders. At the same time he get a suspicious email with a link to a surveillance camera that triggers at a stated time. Is Alexandre exposed to a evil conspiracy, or has his dead wife returned from the grave?