Ryan is a big boy who loves surfing. Like other young people, mobile phones are an essential element in his life. He is enjoying the sun with his friends on Santa Monica Beach, and a special phone call from a complete stranger breaks Ryan's otherwise peaceful and lazy life. On the other end of the phone came the trembling voice of a strange woman. The other party said that she was called Jessica. She was kidnapped and locked in the attic. Her life was threatened and she might die soon. She needs someone's help and hopes Ryan can save her.
Jessica is a biology teacher in a high school. She lives a peaceful life with her husband Craig and son Ricky. But one morning, Jessica had just sent her son Ricky to school, and when she returned home, she was kidnapped by 5 strange intruders, and then taken to a secret attic. Unable to ask for help, she quietly collected the phone fragments smashed by the kidnappers and repaired it to a working condition. Miraculously dialed an unfamiliar phone, hoping to find help, so Ryan received this Inexplicable call.
At first Ryan was dissatisfied with the phone, thinking it was just a prank, but when he heard a man's roar and Jessica's panic cry for help from the other end of the phone, he realized the seriousness of the matter and decided to rescue Jessica. But apart from Jessica's voice, Ryan knew nothing about other things, and that mobile phone became the only tool he could use and the only channel for him to communicate with Jessica. Ryan wanted to transfer the call to the police. Police Mooney, who was about to retire, received him, but unfortunately there was a riot in the lobby of the police station. In a hurry, he sent Ryan to the crime team on the fourth floor. At this time the kidnappers began to threaten Jessica to tell the whereabouts of her husband, or she would kidnap her son. Ryan hurried to the school, but Ryan, who was weak and weak, finally saw Ricky being taken into the car by the kidnappers.
In desperation, Jessica told her husband's whereabouts, and Ryan witnessed Craig falling into the hands of the kidnappers, but he accidentally discovered that the true identity of the kidnappers turned out to be the police. It turns out that not long ago, Craig accidentally captured five police officers headed by Jack with a camera, robbing two drug dealers at work, and seizing their huge amount of drug money for himself. Just when Craig was about to hand over the camera, Ryan showed up in time and took the camera back. Ryan took the initiative to contact the kidnappers and exchanged Jessica’s family with a camera. The two parties made an appointment at the Santa Monica beach that Ryan is most familiar with. Everything went smoothly. Unexpectedly, the friends who killed off in the middle made Ryan mess for a while. Fortunately, the dutiful Mooney felt that things were strange, and went to the beach all the way to track down. The two teamed up to expose the true faces of Jack and the others, and Jessica's family was able to escape safely
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