Definition.com
The Thriller is distinguished from literature in that the more literary (and less thriller) a novel gets, the further down the list of undesirable fates death falls.
Definition.com
The Thriller is the cardinal 20th century literary form. All it, like the 20th century, wants to know is: Who's Guilty?
Definition.com
Thriller is an extension of the fairy tale. It is melodrama so embellished as to create the illusion that the story being told, however unlikely, could be true.
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