Defining the thriller genre
What is a Thriller?
The genre of Thriller is, for the most part, fairly uncontroversial, unless there is debate about the ability of a Thriller to also be Contemporary Literature. Thriller is an extremely broad genre, which encompasses written and televisual texts. Many sub-genres within the genre.
A Thriller contains certain characteristics. The pace must be quick, there has to be a lot of action, and there should be suspense and plot twists aplenty. Thrillers should have the reader on the edge of their seat, wondering if the good guy can get one over the bad guy and save the world (even though it's extremely rare for the bad guy to win, in your classic Thriller).
http://www.illiterarty.com/genre-thriller
and
http://en.wikipedia.org/wiki/Thriller_(genre)