In a sunny California city, a group of friends finds themselves in the midst of a collective nightmare. It all starts when a man, suffering from amnesia and an inexplicable sense of danger, becomes embroiled in a series of brutal murders. His memories are fragmented, but he soon discovers that a strange drug called "Blue Sunshine" has been circulating in the streets, causing devastating effects on those who have consumed it, turning some into deadly psychopaths. As paranoia grips society, the protagonist is forced to uncover the origin of this mysterious substance.
While trying to unravel the mystery, he allies himself with other young people who, like him, are coping with the effects of the drug. Over time, they engage in a cat-and-mouse game with a skeptical police force and an intriguing group of warned individuals who seem to know more than they let on. Their quest for answers leads them to an unexpected conclusion where loyalty and betrayal intertwine, blurring the lines between friend and foe.
The film presents a tense atmosphere, accompanied by a social critique that examines the excesses of 1970s culture and the fine line between sanity and madness. A psychological thriller that delves into the contemporary fears of the time and leaves its audience with more questions than answers as they plunge into this disturbing journey to the heart of madness.