Brest, in 2025 police captain Ludovic Béguin is investigating the death of a woman found drowned on the beach at Corsen. In a virtual reality room to re-study the crime scene captured by drones, Ludovic discovers that he can get in touch with his wife Mélanie, who died on this same beach in 1998. Ludovic then decides to do the impossible, to save the deceased , but altering the past could have serious consequences for the present. For 27 years, Ludovic has rebuilt his life. He has a new wife, Parvana, and a son, Sam...