Psychological Thriller

Here's a breakdown of what a psychological thriller is:

Psychological – Elements that are related to the mind or processes of the mind; they are mental rather than physical in nature.

Thriller – A genre of fiction that attempts to "thrill" its audience by placing characters at great risk. This constant unease throughout the story makes the narrative suspenseful to the reader by creating a tense atmosphere.

Psychological + Thriller – By combining these two terms, the definition changes to a narrative that makes the characters exposed to danger on a mental level rather than a physical one. Characters are no longer reliant on physical strength to overcome their brutish enemies (which is often the case in typical action-thrillers), but rather are reliant on their mental resources, whether it be by battling wits with a formidable opponent or by battling for equilibrium in the character's own mind.

(Reference - Wikipedia (2010) Psychological Thriller. Available from: http://en.wikipedia.org/wiki/Psychological_thriller. Accessed 06.05.2010 )