One great dark psychology fiction novel is 'Gone Girl' by Gillian Flynn. It delves deep into the minds of the two main characters, with complex psychological games and twists. Another is 'The Girl on the Train' by Paula Hawkins, which also has elements of unreliable narrators and dark psychological undertones. And 'Sharp Objects' by Gillian Flynn as well, exploring family dynamics and the dark corners of the human psyche.
Some excellent dark psychology fiction novels include 'Misery' by Stephen King. It shows the extreme situation of a writer held captive by his so - called number one fan, with lots of psychological tension. 'Lolita' by Vladimir Nabokov is another, though controversial, it delves into the complex and disturbing mind of the narrator. And 'The Talented Mr. Ripley' by Patricia Highsmith, which is about a young man who gets involved in a web of lies and psychological manipulation.