Which 2020 Mystery Thrillers Started New Bestselling Series?

2026-07-18 04:08:54
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3 Answers

EdwardPal
EdwardPal
Spoiler Watcher Chef
Don't sleep on 'The Sanatorium' by Sarah Pearse. That book had such a chilling, isolated atmosphere—a luxury hotel in the Swiss Alps converted from an old sanatorium. The setting is practically a character itself, dripping with creepy history.

It launched a series featuring detective Elin Warner, who's grappling with her own traumas while solving these intense cases. The sequel, 'The Retreat', continues with another isolated location. Pearse really carved out a niche with her 'closed-circle' mysteries in stunning but sinister places.
2026-07-19 23:10:40
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PaxBrown
PaxBrown
Favorite read: MAFIA ROMANCE MYSTERY
Bibliophile Librarian
Let's talk about 'The Invisible Life of Addie LaRue' by V.E. Schwab. Not a conventional thriller, but the central mystery of Addie's curse and her deal with a dark god has relentless narrative tension. Its genre-blending success—part historical fantasy, part romance, part philosophical thriller—showed that 'bestselling series' can begin from a place of unique concept rather than pure crime.

The demand for a sequel or companion novel has been huge, proving that a thrilling premise can build a series-ready world.
2026-07-20 18:15:44
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RobMiller
RobMiller
Favorite read: Secret and Lies series
Library Roamer Photographer
For something with a more sci-fi thriller edge, 'Devolution' by Max Brooks (author of 'World War Z') is a Bigfoot horror mystery told through journals and interviews. Its found-footage style creates an incredible pace and a sense of relentless, creeping terror.

While a standalone, its success showed a massive appetite for well-researched, pseudo-documentary style thrillers, potentially inspiring similar series or establishing a subgenre that other authors are now exploring.
2026-07-23 03:37:04
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I'm skeptical of any list that only includes the blockbusters. Digging into critical darlings, 'The Missing American' got fantastic reviews for its authentic setting and complex social commentary woven into the mystery. It's a detective series that uses the genre to explore post-colonial Ghana, corruption, and modernity. That's a series arc with substance, not just a sequence of puzzles. It deserves more attention in this conversation.

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For pure, puzzle-box pleasure, 'The Crooked Mask' by Rachel Burge (a YA horror-mystery set in a circus) was a standout. It combined folklore with a murder mystery in a deeply atmospheric way. It reminded me that the best genre-blenders—mystery meets horror, fantasy, or folklore—often come from the YA space, taking bigger risks with premise. That willingness to mix genres and target a savvy, online audience defined a lot of the most interesting and inventive mystery-adjacent writing that year.

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6 Answers2026-07-18 05:57:23
I lent my copy of 'The Maid' to my mom, and she called me three days later asking if there was a sequel yet. That's the mark of a character people want to follow. Molly the maid feels like a modern-day Miss Marple in training, with her own unique rules for cleaning up messes, both literal and criminal.
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