This film is a personal interpretation of a real event that took place in Uruguay in the early 1970s. An American AID official, usually sent as an advance force to the target country to train local police officers on how to suppress riots, was kidnapped and murdered by local guerrillas. After investigation, it was found that he was originally a special agent of the US government who interfered in the local internal affairs, and he still did not tell the truth after being tortured by the guerrillas, so he was killed. outside this main line, the film also depicts the confrontation between the left-wing guerrillas and the Uruguayan government.