Thirteen, a number that sounds a bit cold. On the thirteenth floor of a building, scientists Douglas Hall (Craig Bick) and Hannon Fuller (Armin Mueller-Stahl) used computers to simulate a realistic Los Angeles in 1937. They can enter this virtual world through computers and truly experience life and themselves in 1937. However, one night, Fuller was killed, and various clues showed that it seemed to be Hall's doing. But Hall had no memory of what happened that night. At this time, a woman who claimed to be Fuller's daughter mysteriously appeared again, but Hall had never heard Fuller say that he had a daughter... In order to find the murderer and understand the truth, Hall followed the clues left by Fuller to the virtual world, and he was getting closer and closer to the truth... so close that he was suffocating...