Genre guide · Fiction

Mystery: word count & book length

How long a mystery book should be, which trim sizes suit it and what that means in printed pages. Typical length: 70,000–90,000 words.

70,000–90,000 wordstypical length
16,017works in Open Library

About mystery

A crime — usually a murder — is solved over the course of the book, and the reader is given a fair chance to solve it too. Series potential is a big selling point.

Printed length in recommended trim sizes

TrimPages at 11 ptSpine (white)
5.5 x 8.5 in Digest274–358 pages0.62–0.81 in
6 x 9 in US Trade242–314 pages0.54–0.71 in
5 x 8 in336–428 pages0.76–0.96 in

Page counts for these lengths

Tips for this category

  • Readers binge series: plan consistent trim size, typography and cover branding from book one.
  • Keep a clue ledger (where each clue is planted and paid off) during revisions.

About Mystery

Mystery is a fiction genre where the nature of an event, often a murder or other crime, remains mysterious until the end of the story. Often within a closed circle of suspects, each suspect is usually provided with a credible motive and a reasonable opportunity for committing the crime. The central character is often a detective (such as Sherlock Holmes), who eventually solves the mystery by logical deduction from facts presented to the reader. Some mystery books are non-fiction. Mystery fiction can be detective stories in which the emphasis is on the puzzle or suspense element and its logical solution such as a whodunit. Mystery fiction can be contrasted with hardboiled detective stories, which focus on action and gritty realism. Mystery fiction can involve a supernatural mystery in which the solution does not have to be logical and even in which there is no crime involved.

From the Wikipedia article “Mystery fiction”, licensed under CC BY-SA 4.0.

Most-published mystery works in Open Library

TitleAuthorFirst publishedEditions
The Secret GardenFrances Hodgson Burnett19111,598
A Study in ScarletArthur Conan Doyle18871,447
The Hound of the BaskervillesArthur Conan Doyle19001,309
The Adventures of Sherlock Holmes [12 stories]Arthur Conan Doyle18921,134
The MoonstoneWilkie Collins18001,005
The Sign of FourArthur Conan Doyle1889962
The Woman in WhiteWilkie Collins1859653
The Story of the AmuletEdith Nesbit1905578
The Invisible ManH. G. Wells—563
The Return of Sherlock HolmesArthur Conan Doyle1903545

Open Library lists 16,017 works under this subject.

Frequently asked questions

How long should a mystery book be?
Typically 70,000–90,000 words. A crime — usually a murder — is solved over the course of the book, and the reader is given a fair chance to solve it too.
What trim size is best for mystery?
Common choices are 5.5 x 8.5 in Digest, 6 x 9 in US Trade, 5 x 8 in.

Sources & data