Thriller as a genre explained

The thriller is a broad genre of literature, film, and television. It includes numerous, often overlapping sub-genres.

Thrillers are characterized by fast pacing, frequent action, and resourceful heroes who must thwart the plans of more-powerful and better-equipped villains. Literary devices such as suspense, red herrings, and cliffhangers are used extensively. Thrillers often take place wholly or partly in exotic settings such as foreign cities, deserts, polar regions, or high seas. The heroes in most thrillers are frequently "hard men" accustomed to danger: law enforcement officers, spies, soldiers, seamen, or aviators. However, they may also be ordinary citizens drawn into danger by accident. While such heroes have traditionally been men, women have become increasingly common.

Thrillers often overlap with mystery stories, but are distinguished by the structure of their plots. In a thriller, the hero must thwart the plans of an enemy, rather than uncover a crime that has already happened. Thrillers also occur on a much grander scale: the crimes that must be prevented are serial or mass murder, terrorism, assassination, or the overthrow of governments. Jeopardy and violent confrontations are standard plot elements. While a mystery climaxes when the mystery is solved, a thriller climaxes when the hero finally defeats the villain, saving his own life and often the lives of others. In thrillers influenced by film noir and tragedy, the compromised hero is often killed in the process.

In recent years, when thrillers have been increasingly influenced by horror or psychological-horror exposure in pop culture, an ominous or monstrous element has become common to heighten tension. The monster could be anything, even an inferior physical force made superior only by their intellect (Saw), a supernatural entity (Dracula, Christine books, The Amityville Horror, The Ring), aliens (H. P. Lovecraft's Cthulhu mythos books), serial killers (Halloween, Friday the 13th, The Texas Chainsaw Massacre, and Psycho), or even microbes or chemical agents (Cabin Fever, Richard Matheson's The Last Man On Earth, 28 days later). Some authors have made their mark by incorporating all of these elements (Richard Laymon, F. Paul Wilson) throughout their bibliographies.