2000 American science fiction suspense film directed by Gregory Hobrit and starring Dennis Quaid, James Cavize, and Elizabeth Mitchell.

On October 12, 1969, firefighter Frank was killed in a fire accident, leaving his six-year-old son John and his wife, a nurse, to fend for themselves.
By 1999, John had grown up and was now a policeman, and by chance, he turned over an old radio station used by his father in the family, and two days later was his father's sacrifice day.
That night the sky was as beautifully flickering as it had been thirty years earlier, caused by the unusual movement of sunspots that would seriously interfere with the frequencies of radio waves. John tried to turn on the radio, and unexpectedly found that it could still be used, and a man's voice came, and the conversation continued, and the other party always talked about the 1969 World Cup baseball game, and John informed him of the results of the next few games. It was later discovered that the two were using the same radio station and had the same home address, the only difference being that they were thirty years apart, and that the other was his father, Frank.
The father and son span thirty years and engage in a time-space dialogue, John's first reaction is to stop the tragedy of his father's death, he tells his father that he will die in a fire accident tomorrow, ask him not to go to the seed company, if he must go, then do not follow his own ideas, another path may be able to escape.
Frank was surprised to see the baseball game that day, and it was exactly the same as the man who claimed to be his son, and he was about to go to the seed company to extinguish the fire. Frank began to believe john's words, he ventured into the fire to save people, it was difficult to find the girl but because of the failure of the life-saving ladder, he could only evacuate from the inside, he remembered his son's words, unusually chose the exit that was flooded by the fire, and successfully escaped from the fire along the grain delivery channel.
Frank escapes, and at the same time, John suddenly has many memories of his father in his mind, who died not from the fire thirty years ago, but from lung cancer ten years ago. The father and son talked a lot on the phone, Frank believed in him, and John advised him to quit smoking as soon as possible.
After saying goodnight that night, frank, who was reborn after the disaster, found his wife who was working overtime and hugged her to express her love, and the wife suddenly saw that the assistant doctor had given the wrong medicine to a patient and avoided a medical accident, but she did not expect that the patient who saved it caused a bigger change.
John's memory was renewed again, and there was no mother in the family photo. He went to work to investigate the Nightingale murder again, an old case from thirty years ago, in which the four dead were nurses, whose whereabouts are still unknown, and whose whereabouts are still unknown, and whose bones have recently been discovered, but when John sorted out the case, he found that the number of victims had increased to ten, including his mother.
The patient saved by the mother Fang Nian is a murderous demon, resulting in more people being killed later, he should have died of medical accidents, but because John saved his father, his mother was able to continue to work that day, and inadvertently saved the murderer, so that he could continue to do evil, so that the butterfly effect was produced, and the mother was killed.
A week before his mother's tragic death, John contacted his father again to let him catch the murderer in advance to prevent him from killing more people, and now directly calling the police or letting the victim be strictly guarded will only be regarded as a madman, John told Frank the details of the next victim, let him stay in advance, in order to find the murderer to stop him from committing the crime.
Frank finds the blonde nurse and chats with her until late to make the murderer inoperable, so he saves her, and when Frank finds a second nurse again and prepares to save people in the same way, the real murderer comes to the door, sneaks up on Frank and knocks him unconscious, taking the driver's license from his wallet, and Frank does not see the murderer's appearance, when he wakes up and rushes to the nurse's house to find that she has been killed.
Now frank's family may be retaliated by the murderer at any time, John proposes to let Frank wrap the wallet that the murderer touched in a plastic bag and put it in a place where no one will move for thirty years, get the wallet himself through the fingerprints on it, find the murderer, he was once a policeman, this pervert even killed his own mother, plus his own identity to divert the attention of the police, so he is still at large.
But this can not be used as evidence, John told his father to let him find an opportunity to report the murderer, because he has the habit of collecting the victim's jewelry, before he can tell more, Frank was summoned by the police, because his driver's license was found under the body of the murdered nurse, so Frank was taken back to the police station as a suspect for questioning, and the radio was overturned during the dispute, and the father and son disappeared.
Even though Frank tried to defend himself with the truth, no one was convinced, so he said the results of the next baseball game to prove that he was right, and the police thought he was insane and went out to comfort his wife. At this time, the murderer came to the interrogation room and wanted to kill the person, but fortunately someone came in to stop him, frank seized the opportunity, used the wire and coffee conduction to corona the murderer who came in again, and then triggered the fire system of the police station and left in the chaos.
The police saw the result of the match, as Frank had said, realized that what he said might be true, and hurried back to organize the arrest. Frank came to the murderer's house and found evidence of his crime, but before he could take it away, the murderer rushed to chase him, Frank led him to the dock and dragged him into the water, thinking that the other party had drowned and left the scene, the police found the evidence, but also let Frank get rid of the suspect.
In the night, Frank repairs the radio and tells his son the result, but John sees that there is still no mother in the family portrait, indicating that the murderer has succeeded and is thinking about what is going on, when the murderer comes to the house and attacks John, only because John once found the murderer and said that he was collecting evidence to convict him.
Also at the end of the radio, Frank was also retaliated by the young murderer, he held little John hostage to let Frank tie his hands, both sides were subdued by the murderer, seeing that they were going to GG, the mother suddenly jumped out to let little John get out of the control of the murderer, Frank hurriedly took a gun and shot off his right hand, here John was rescued, and the elderly Frank appeared to kill the murderer.
It turned out that Frank listened to his son again, resolutely quit smoking and got rid of lung cancer to live to the present, the son saved his father twice, and finally the father saved his son once. The ending is that the parents are alive, John is married and has children, and the three generations of grandchildren live together, warm and happy, and happy.