Best Mystery Series Latest (2026): 5 New Books Compared

If you are hunting for the best mystery series latest releases, start with the flavor you like: a long-running thriller series or a cozy village mystery. We compared five series novels by author, publication date, series position, print length and the book description, so you can find the next series to follow.

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The picks

#	Product	Shelf Score	Buy
1	Delusional by Patterson	9.6/10	Buy
2	An Inside Job by Silva	9.5/10	Buy
3	Was It Murder? by Dennis	9.5/10	Buy
4	Murder's the Word by Minix	9.5/10	Buy
5	A Game of Murder by Davies	9.5/10	Buy

1

Delusional by Patterson

James Patterson·9.6/10 Shelf Score

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The Shelf Score runs from 9.2 to 9.8 and weighs fit for the reader or goal (35 points), contents and edition (25), value (25) and listed reading age or level (10, where the listing gives one), using only what the book listing states. How we pick ›

James Patterson's Michael Bennett thriller, Book 18 of 18, published August 17, 2026; suits readers following the series to its latest installment.

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Pros

• Book 18 of 18 in the Michael Bennett series, the latest installment
• August 17, 2026 publication date is the newest on this list
• Cross-country case from New York City to Montana, per the description

Cons

• The listing does not state a print length
• No reading age or grade level is stated
• The description includes bombs, burglary and arson; expect violent content

2

An Inside Job by Silva

Daniel Silva·9.5/10 Shelf Score

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The Shelf Score runs from 9.2 to 9.8 and weighs fit for the reader or goal (35 points), contents and edition (25), value (25) and listed reading age or level (10, where the listing gives one), using only what the book listing states. How we pick ›

Daniel Silva's Gabriel Allon novel, Book 25 of 27, about a stolen Leonardo and Vatican intrigue; suits readers who like art-world spy stories.

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Pros

• Book 25 of 27 in the Gabriel Allon series, a long-running spy series
• Art-theft plot around a lost Leonardo da Vinci, per the description
• July 15, 2025 publication date stated

Cons

• The listing does not state a print length
• No reading age or grade level is stated
• As Book 25 of 27, newcomers start deep into the series

3

Was It Murder? by Dennis

Pamela Frost Dennis·9.5/10 Shelf Score

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The Shelf Score runs from 9.2 to 9.8 and weighs fit for the reader or goal (35 points), contents and edition (25), value (25) and listed reading age or level (10, where the listing gives one), using only what the book listing states. How we pick ›

A 304-page cozy mystery, Book 4 of 6, set in an English village; suits readers who like light village mysteries with a quirky heroine.

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Pros

• 304 pages stated, the only print length given on this list
• Book 4 of 6 in the Murder Blog Mysteries series
• The description pitches it to readers who like fast-paced, edgy-cozy mysteries

Cons

• January 20, 2025 publication date is the oldest here
• No reading age or grade level is stated
• The description mentions a family death and murder; cozy but not crime-free

4

Murder's the Word by Minix

Sue Minix·9.5/10 Shelf Score

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The Shelf Score runs from 9.2 to 9.8 and weighs fit for the reader or goal (35 points), contents and edition (25), value (25) and listed reading age or level (10, where the listing gives one), using only what the book listing states. How we pick ›

A cozy bookstore mystery, Book 7 of 8, published August 13, 2026; suits readers who like bookish small-town sleuths.

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Pros

• Book 7 of 8 in the Bookstore Mysteries series
• August 13, 2026 publication date, among the newest here
• Bookstore-owner sleuth suits readers who like bookish cozies

Cons

• The listing does not state a print length
• No reading age or grade level is stated
• As Book 7 of 8, series newcomers miss earlier books

5

A Game of Murder by Davies

M. R. G. Davies·9.5/10 Shelf Score

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The Shelf Score runs from 9.2 to 9.8 and weighs fit for the reader or goal (35 points), contents and edition (25), value (25) and listed reading age or level (10, where the listing gives one), using only what the book listing states. How we pick ›

A locked-room cosy crime novel, Book 2 of the Cosy Crime Club series, readable as a standalone; suits whodunit fans who like country-house settings.

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Pros

• The listing states each title reads as a standalone mystery
• Locked-room country-house setup with a snowstorm, per the description
• March 6, 2026 publication date stated

Cons

• The listing does not state a print length
• No reading age or grade level is stated
• The description includes a death by falling from a tower; preview for sensitive readers

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Compare the picks

Book details as published on each listing, collected 20 October 2026.

How we scored them

The Shelf Score weighs fit for the reader, contents and edition, value, and the listed reading age or level where one is given. None of the five listings states a reading age or grade level. How we pick explains the weights.

Scores run from 9.2 to 9.8: each book’s point total is placed on that range, so more points always means a higher score. Reading age or level counts on a list where at least one listing gives one, and a book whose listing gives none then scores zero on it. Where no listing gives one, the score is taken over the other 85 points. Books carry no warranty, so warranty is not scored.

How to choose the best mystery series latest

Thriller series or cozy series

The list splits two ways. Delusional (Book 18 of 18) and An Inside Job (Book 25 of 27) are big-canvas thrillers with spies, bombs and stolen art. Was It Murder?, A Game of Murder and Murder’s the Word are cozies: villages, bookshops and amateur sleuths, with murders but little gore. For more gentle options, browse our quirky mystery series list.

Check the series number before you commit

Three of these sit deep in long series: Book 18 of 18, Book 25 of 27 and Book 7 of 8. Starting at Book 25 means missing years of backstory, so newcomers may prefer Was It Murder? (Book 4 of 6) or A Game of Murder, whose listing states each title reads as a standalone. For the newest arrivals across series, see our recent mystery series list.

Mind the publication date

Delusional lists August 17, 2026 and Murder’s the Word lists August 13, 2026, the two newest here. A Game of Murder follows with March 6, 2026, while Was It Murder? is a January 20, 2025 listing, the oldest. Newer dates usually mean current cover art and typesetting; older ones read just as well.

Before you buy

• For a series, start at Book 1 unless the listing states standalones: only A Game of Murder makes that claim.
• Was It Murder? is the only pick with a stated print length, 304 pages; the other four listings do not state one.
• No listing here states a reading age or grade level, so read the description for violent content before buying for a younger reader.

Frequently Asked Questions

Which mystery series should I start next?

For thrillers, Delusional is Book 18 of 18 in the Michael Bennett series and An Inside Job is Book 25 of 27 in the Gabriel Allon series. For cozies, try Was It Murder? (Book 4 of 6 in the Murder Blog Mysteries) or A Game of Murder, whose listing states each title reads as a standalone.

Which of these books is the longest?

Was It Murder? lists 304 pages, the only print length stated here. The other four listings do not state a page count.

Are these books appropriate for teens?

No listing states a reading age or grade level. The thriller descriptions include bombs and murder, while the cozies center on murder in gentle settings; preview any pick before giving it to a younger reader.

Still deciding? Our top pickDelusional by Patterson

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Related lists

See every thriller and mystery list and all fiction lists.

More lists: browse recent mystery series, quirky mystery series and thriller and mystery books.