Based on a true story, an infamous serial killer, who assaulted and killed several women in the 90s, gets on a collision course with a young journalist eager for the truth and a career-changing article.

The Park Maniac dives into the story of one of Brazil's most notorious serial killer, the motorcycle courier Francisco, who was accused of attacking twenty-three women, murdering ten of them, and hiding their bodies in a park in São Paulo in the 1990s. Elena, a young reporter, investigates the crimes as a means to boost her career. While Francisco continues to live freely, skating through parks and attacking women, his fame in the sensationalist media grows dramatically, causing fear and terror across the country.