Déjà Vu is a 2006 American science fiction action film

Plot

In New Orleans, a ferry carrying U.S. Navy sailors and their families across the Mississippi River for Mardi Gras explodes, killing 543 people. ATF Special Agent Doug Carlin discovers evidence of a bomb planted by a domestic terrorist, and examines the body of Claire Kuchever, seemingly killed in the explosion but found in the river shortly before the blast. Informing Claire's father and searching her apartment, Doug learns that she called his ATF office the morning of the bombing, and determines that she was abducted and killed by the bomber hours before the explosion.

Impressed with Doug, FBI Special Agent Paul Pryzwarra invites him to join a new governmental unit investigating the bombing. Led by Dr. Alexander Denny, the team utilizes asurveillance program called "Snow White", which they claim uses previous satellite footage to form a triangulated image of events four-and-a-half days in the past.Convinced that Claire is a vital link, Doug observes her past footage and is able to track the soon-to-be-bomber when he calls about a truck she has for sale.

Deducing that Snow White is actually a time window, Doug persuades the team to send a note to his past self with the time and place the suspect will be.His partner Larry Minuti finds the note instead, and is shot attempting to arrest the suspect and taken outside of Snow White's range. Doug is able to follow the suspect's past movements using a mobile Snow White unit, witnessing him kill Minuti.

In the present, the bomber is taken into custody after facial recognition systems identify him as Carroll Oerstadt, an unstable "patriot" rejected from enlisting in the military. He confesses to killing Minuti and Claire, taking her truck to transport the bomb and staging her death as one of the ferry victims. The government closes the investigation, but Doug, convinced that Snow White can alter history, persuades Denny to send him into the past to save Claire and stop the bombing.

Doug survives the process by being sent back to a hospital emergency room, where doctors are able to revive him. Stealing a gun and an ambulance, he arrives in time to stop Claire's murder, while Oerstadt shoots him and flees with the bomb. Doug drives Claire to her apartment to treat his wound, but a suspicious Claire holds him at gunpoint and calls the ATF to confirm his identity — the call his office received the day of the bombing. He convinces her of the truth, realizing that he unknowingly came across evidence in the present of his visit to the past.

Doug boards the ferry to find the bomb in Claire's truck, but Oerstadt realizes he has been followed and captures Claire, tying her to her truck's steering wheel. A gunfight ensues, but Doug distracts Oerstadt with information from his future interrogation, and Claire rams him with the truck, allowing Doug to shoot him dead. Surrounded by police and out of time to disarm the bomb, Doug drives the vehicle into the river, saving the passengers as Claire swims free, but he is unable to escape and dies in the subsequent underwater explosion. Mourning his death, Claire is approached by the Doug Carlin from her present timeline.