Psychological horror often uses mystery elements and characters with unstable, unreliable, or disturbed psychological states to enhance the suspense and horror.
The subgenre frequently overlaps with the related subgenre of psychological thriller , and it often uses mystery elements and characters with unstable , unreliable , or disturbed psychological states to enhance the suspense and horror of the setting and plot and to provide an overall unpleasant , unsettling , or distressing atmosphere .	subgenre	genre	horror	horror fiction	psychological thriller	psychological thriller	mystery	mystery fiction	suspense	suspense	atmosphere	Mood (literature)
