Patrick Bateman is a homicidal maniac working on the New York stock exchange. His reasons for killing are debatable, such as extreme envy of fellow co-workers, material obsession, pure hatred or simply no other reason than complete insanity. His lunacy escalates throughout the film, killing at least 20 people in the process, including models, homeless people, co-workers, friends, and anyone else who stands in his way, be it rage, jealousy, or something else. The only person who he seems to sympathise with is his secretary, Jean, who eventually he can't help but have a desire to murder her. Many times, Patrick can't tell whether these events are real, or simply part of a psychotic delusion brought on by his problems.