The document discusses the crime thriller genre. It defines a crime thriller as a subgenre that blends suspenseful thriller elements with crime plots, typically focusing on serial killers, murders, robberies or manhunts. Crime thrillers use both action and psychological tension to build suspense. Key conventions of the genre include a fast pace, protagonists and antagonists, investigations or subplots, action scenes, high intensity, and an enigma or mystery element. The document then analyzes the 2014 film A Walk Among the Tombstones as an example of the crime thriller genre.