The document discusses three sub-genres of thriller films: psychological thrillers, spy thrillers, and techno thrillers. Psychological thrillers rely on mental conflict between characters rather than violence and focus on mysteries. Spy thrillers usually involve government agents working against rival groups or governments. Techno thrillers explore the manipulation of new technologies and what could happen if they go wrong. Examples provided include the films Psycho, Tinker Tailor Soldier Spy, and Jurassic Park.