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Mystery, Horror, Thriller - What's The Difference?

Mystery, Horror, Thriller – What’s The Difference?

Learn the differences between mystery, horror, and thriller fiction. Compare each suspense genre and get practical tips to write them with confidence.

People are often confused about genres involving crime and suspense, especially those of mystery, horror, and thrillers.

Mystery, Horror, Thriller – What’s The Difference?

All three genres involve crimes. All three deal with the unknown. All three hinge on suspense, but in varying degrees and pace.

  1. Mystery fiction includes police procedurals, private detectives, hardboiled fiction, and cozy mysteries. A crime has already been committed (usually a murder) and the story is about finding out who did it.
  2. Horror fiction includes gothic, paranormal, and non-supernatural stories. A crime is being committed (usually a murder) and the reader is forced to watch it as it happens.
  3. Thriller fiction includes psychological, action, crime, medical, political, espionage, legal, and science fiction stories. A crime is about to be committed (usually a murder – or the end of mankind) and the protagonist has to try and stop it from happening.

Tips For Choosing Your Genre

How do you choose your genre?

How Do I Write A Mystery?

Write a mystery if you enjoy puzzles and developing a formula for solving a crime. You will have to create a sleuth – this could be a professional, like a police inspector, or a private investigator, or somebody who happens to like uncovering mysteries – priest detectives are popular. There are many famous fictional detectives. They have to deal with suspects to find the criminal. The great part about writing a mystery is that it follows a typical plot. Read: What Is A Plot? – A Writer’s Resource

Suggested reading:

  1. 5 Fabulous Tips For First-Time Crime Writers
  2. Why People Read Detective Novels
  3. 7 Important Crime-Writing Guidelines
  4. How To Write Hardboiled Fiction
  5. The 5 Pillars Of Police Procedurals

Michael Connelly and Ian Rankin write mysteries. Their detectives, Harry Bosch and John Rebus solve the crimes.

How Do I Write Horror?

Write a horror story if you are good at writing sitting-on-the-edge-of-your-seat suspense. Everything is in the moment. We are already at (or near) the crime scene. You have to actually write the crime as it is happening. You have to be good at including horrific details whether physical or psychological.

Suggested reading: 

  1. The Essential Guide To Writing Horror Stories
  2. The 3 Pillars Of Horror
  3. 101 Horror Tropes For Writers
  4. Horror Masters: 3 Spooky Tips To Write Like Lovecraft, Poe, & King
  5. 10 Ways To Kick-Start Your Horror Story

Edgar Allan Poe, H.P. Lovecraft, and Stephen King write horror.

How Do I Write A Thriller?

Write a thriller if you are good at foreshadowing. Write a thriller if you love the anticipation and suspense as you watch the protagonist trying to stop something happening (usually a murder – or the end of the world). Use a ticking clock – or some other deadline to quicken the pace and raise the stakes. Include plenty of cliffhangers in this genre. Readers like the excitement, intrigue, and tension in these stories.

Suggested reading:

  1. The 5 Pillars Of Thrillers
  2. Thriller Book Title Generator
  3. Why The Silence Of The Lambs Is A Masterclass For Thriller Writers
  4. 10 Ways To Create Dangerously Nuanced Antagonists
  5. How To Create Tension In Storytelling

Lee Child writes thrillers. His hero, Jack Reacher usually races against the clock to stop a crime from being committed. Thomas Harris writes psychological thrillers with Clarice Starling trying to catch a killer.

The Last Word

Mystery, horror, and thriller stories all create suspense, but they do it in different ways. Understanding what makes each genre unique will help you meet readers’ expectations. Use these differences to choose the genre you’d like to write. If you’re still looking for more resources, click here: Top Crime Writing Resources Every Writer Needs


by Amanda Patterson
© Amanda Patterson

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Posted on: 30th June 2026
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1 thought on “Mystery, Horror, Thriller – What’s The Difference?”

  1. Nancy LaFever

    I mainly edit horror and I disagree that a crime/murder is always involved. Not been my experience.

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