Kennedy's assassination has become a cold case in American history, and the film re-examines that period of history, whether the killer is an ordinary person, or the whole huge political conspiracy, truth and illusion, are gradually revealed in the investigation. The official killer was arrested within two hours of the president's assassination. he was Rijave Oswaldo. Coincidentally, however, in the following hour, the suspect was quickly killed by a hooligan. After investigation, the authorities still identified Rijave Oswaldo as the real culprit. But three years later, a U.S. district attorney, Jim Garrison (Kevin Costner Kevin Costner), discovers that Kennedy was shot and speculates about the official miscalculation, and then his investigation is implicated in a historic conspiracy.