Psychological thriller is a specific sub-genre of the broad ranged thriller with heavy focus on characters. However, it often incorporates elements from the mystery

Mystery fiction

Mystery fiction is a loosely-defined term.1.It is often used as a synonym for detective fiction or crime fiction— in other words a novel or short story in which a detective investigates and solves a crime mystery. Sometimes mystery books are nonfiction...

 and drama

Drama film

A drama film is a film genre that depends mostly on in-depth development of realistic characters dealing with emotional themes. Dramatic themes such as alcoholism, drug addiction, infidelity, moral dilemmas, racial prejudice, religious intolerance, poverty, class divisions, violence against women...

 genre

Genre

Genre , Greek: genos, γένος) is the term for any category of literature or other forms of art or culture, e.g. music, and in general, any type of discourse, whether written or spoken, audial or visual, based on some set of stylistic criteria. Genres are formed by conventions that change over time...

, along with the typical traits of the thriller genre. In addition to drama and mystery, many psychological thrillers contain elements of, and often overlap with, the horror

Horror film

Horror films seek to elicit a negative emotional reaction from viewers by playing on the audience's most primal fears. They often feature scenes that startle the viewer through the means of macabre and the supernatural, thus frequently overlapping with the fantasy and science fiction genres...

 genre, particularly psychological horror

Psychological horror

Psychological horror is a subgenre of horror fiction that relies on character fears, guilt, beliefs, eerie sound effects, relevant music and emotional instability to build tension and further the plot...

.

• Psychological
  Psychology
  Psychology is the study of the mind and behavior. Its immediate goal is to understand individuals and groups by both establishing general principles and researching specific cases. For many, the ultimate goal of psychology is to benefit society...
  
  – Elements that are related to the mind or processes of the mind
  Mind
  The concept of mind is understood in many different ways by many different traditions, ranging from panpsychism and animism to traditional and organized religious views, as well as secular and materialist philosophies. Most agree that minds are constituted by conscious experience and intelligent...
  
  ; they are mental rather than physical in nature.