Spine curling , emotions swirling , plot deepening , until its the climax.
Makes u wanna put your screen off , think for hours ,while tears stream down your face and u think " I can't take this anymore" , then u start reading again cuz damn the cuRiOsiTy, and then 'THE END' leaves you staring at the wall and contemplating about the meaning of life.
That's the true essence of psychological thriller.