Seymour is a mentally challenged young man living in New York. Seymour's happy New York Knicks fan existence comes to a tragic end after he witnesses the assassination of his mother, a renowned civil rights activist. Things go from bad to worse when Seymour locates a firearm in the home of his best friend, Francis. Determined, desperate and deranged, Seymour goes on one man's journey to find his mother's killers and bring them to justice.