A Seattle history professor, drawn back to his estranged family on the Oregon coast to execute his late mother's estate, is reaquainted with his best friend from childhood, with whom he has a long-awaited tryst. Caught in an accelerating series of events, he discovers aspects of his father's New Age cult which take on a dangerous and apocalyptic significance.

The teenager and skateboarder Alex is interviewed by Detective Richard Lu that is investigating the death of a security guard in the rail yards severed by a train that was apparently hit by a skate board. While dealing with the separation process of his parents and the sexual heat of his virgin girlfriend Jennifer, Alex writes his last experiences in Paranoid Park with his new acquaintances and how the guard was killed, trying to relieve his feeling of guilty from his conscience.