Maniac Tales tells the story of Juan, a Mexican illegal immigrant in New York, who is offered a job as a doorman in an old building of the city. It turns out that the screenwriter of "Maniac Tales", a very popular TV series, lives in the building but has disappeared with the script of the last episode of the season, and a reward is offered to whomever can find that script. Juan decides to investigate and search for it, and when he gets into the screenwriter's apartment he finds out that the TV series hides creepy secrets which are related to the building.