Internet research

http://en.wikipedia.org/wiki/Thriller_(genre)
Horror thriller - In which conflict between the main characters are mental, emotional, and physical. Two recent examples of this include the Saw series of films and the Danny Boyle’s 28 Days Later. What sets the horror thriller apart is the main element of fear throughout the story. The main character(s) is not only up against a superior force, but they are or will soon become the victims themselves and directly feel the fear that comes by attracting the monster’s attention. Other well-known examples are Alfred Hitchcock’s Psycho and Thomas Harris’s The Silence of the Lambs.