Gleaming the Cube (1989)

An Orange County teenager spends his days ditching class and skateboarding in abandoned pools, until the mysterious death of his adoptive brother disrupts his carefree life. When the police call it a suicide, the young skater refuses to accept their ruling. Convinced there is more to the case, he begins his own investigation and uncovers signs of a conspiracy, using the world he knows best to search for the truth.