8mm (1999)

tom welles, private investigator, leads a quiet life with his wife amy and their child, dealing mainly with cases of infidelity. one day, however, an eight-millimeter reel, found by a widow in her husband's safe, violently tears her from her routine: it's a snuff movie about the frightening disappearance of a young woman. the obsession with the new case, also fueled by an adult bookstore clerk, max, will take welles from the los angeles sidewalks to the hell of new york's extreme porn, upsetting his existence forever.