Best Mature Mystery Fanfics
The 25 most-loved mature mystery fanfics on AO3, ranked by kudos. A fair-play mystery makes the reader a participant, and fandom's deep character knowledge makes the misdirection more fun — you know these people, and you're still wrong.
Top 25 Mature Mystery Fanfics
Ranked by AO3 kudos. Every fic on this list is tagged with mystery and rated Mature.
Divided We Stand
by KouriArashi
Derek is being pressured by his family to pick a mate, and somehow stumbles into a choice that they didn't expect and aren't sure they approve of....
Serendipitous Fate
by SKayLanphear
Adrien is excited to reveal his true identity, while Marinette is terrified. But Master Fu says they can't afford to be distant any longer. Chat Noir and Ladybug are meant to work in tandem both in and out of uniform, their strength stemming from the bond created between them. Yet, teenagers are som
Chaos for the Fly
by LaylaJeffany
“Wednesday, you are so new to love’s torturous sting. It simply takes time to get used to the poison, my darling. You have to build up a tolerance for it. Then – you’ll start to wonder how you ever lived without it.” Enid accidentally summons a malevolent spirit in an attempt to communicate with he
L’appel du vide
by Xov
Akechi Goro is alive – one of his biggest regrets is alive and standing in front of him looking like he’s ready for some highbrow sports photo shoot when what he really needs is five years intensive therapy and at least five more steps away from Akira.No, no, no – the universe is not allowed to shov
25,244
by mediocre_kazoo_player
Nobody likes Kokichi Ouma. When he drops out of Hope's Peak after junior year, a ding-dong-the-witch-is-dead sense of relief pervades class 79....Things are a little different for Saihara, who hates himself for deciding to hold off on confessing (yes, confessing) to Ouma until their senior year. Ste
Nightfall
by RainFox88
Pre-Resident Evil 1, slight-canon divergence/AU. Claire Redfield comes home to visit her brother Chris for the holidays but gets caught up in a dangerous game of cat and mouse with Albert Wesker, the Captain of STARS, after stumbling upon dark secrets. She can't call the law; Wesker is the law, and
The Late Llewellyn Drake
by wanna_have_fun
BILLIONAIRE DOOFUS DRAKE FOUND DEAD IN MANSION ON ANNIVERSARY OF WIFE’S DISAPPEARANCE; PRESUMED SUICIDE Webby stared at her laptop screen in shock. She knew that name, though she hadn't heard it in years, since before... well. Before a lot of things. Before everyone got quiet and started walking on
Each Time You Fall
by ECSDaydreamBeliever
“Ectoplasm switched to teaching all of the Hero Ethics courses after Whirlpool left. He isn’t teaching Quirk Analysis this semester until they get a replacement,” Ashido told him in an exaggerated whisper, “Shit,” he groaned. More than a few of the teachers at UA didn’t like him due to his bad attit
One Flew Over the Fwooper's Nest
by Mothboss
"Stop me if you've heard this one: a mental patient, a witch, and a priest walk into the village pub..." -o-o-o- It turns out that if you tell the staff at a Muggle psychiatric hospital that you're a wizard, the former headmaster of a magical school, and also a murderous, serial-killing gang member
MHA: The Value of a Thief
by Taiman215
Heroes, righteous and hopeful...they are the ones that believe in and protect the peace. Villains, corrupted and chaotic...they are the ones that despise and wants to destroy this hero society. However there are those in between that work in the shadows to reform this society by changing the Hearts
Another monster
by Oddornot
Dead for centuries, you were reborn. Into a body you didn't know and into a place unknown to you. Once your nice life gets ruined, you have to fit in as best you can. Would you make it? Another take on my book, Two and a half outlaw. Later version of Owen is based of the fab version that belongs to
Mother Knows Best
by TheLivingMyth
Long before the Citadel Council, before the Protheans, even before the mysterious Inusannon, the galaxy was not silent. An ancient, ferocious race emerged - not by chance, but by necessity. Born from the will of nature itself, they were forged to challenge an enemy that had disrupted the natural cyc
Would I lie to you?
by Avocadofairy
Nearly four years have passed since Adora left Horde High and her childhood best friend Catra behind and moved to the other side of Etheria, thinking she would never see her friend again. She worked her way up to the very top then, getting accepted at the best college in Bright Moon. Everything goes
It's Gonna Get Weird
by iknowwhyulikeoscarwilde
In the small town of Hunter Falls, Illumi is able to flourish. Out from under his parents' thumb, he can finally live as his authentic self and explore the mysteries of the town along with his boyfriend Hisoka. But when Illumi leans too close into the mysteries of the town, he runs the risk of being
So I Return To You
by Sanska
Upon discovery, they do not return, these wives and lovers of humankind. For they are not human, with human wills and emotions, and their true natures are instead imbued with a singular divine purpose. Do not find fault in yourself, my lord. They must forsake you, bound to this end by the laws that
How my heart bleeds
by fairicherry
El suspects Max is a vampire
In Bad Times and in Worse
by Manerenam
Nearly a decade after graduating from the academy, a series of regrettable events leads Team Maka to an unconventional assignment. Surveillance and subtlety, it turns out, do not count among their strengths. Luckily for the two of them, they make for a rather convincing married couple - endless bick
Tooru and Hajime: Annotated Edition
by riverdaze
When a marriage offer from the powerful Seijoh landed at the small kingdom of Kitagawa's walls, it was too tempting, and perhaps dangerous, for the Iwaizumis to refuse. Upon arrival, the alpha Prince Hajime found Seijoh as grand as he imagined, and his new husband and potential mate, the omega Princ
Digging Up Stones
by mostmagical
A long-term ground mission on Hackett’s orders in the wake of the war. Traveling across forgotten wastelands and destroyed communities with just a ground car and Garrus, Shepard can’t help but let exhaustion and frustration get to her. Even on the open road, she’s never felt more trapped. And with t
Have a Nice Death
by Frost5ive
Find My Body. After hearing those cryptic words from a girl he encountered in the gents', Alastor finds himself thrust into a time loop. He gathers clues during the day and finds her missing body parts at night, all while evading a girl who is out for blood. He's not alone, though. Accompanying him
Capitol Wasteland
by BunsRevenge
"This isn't a get out of jail free card," she explains, walking him back to the locker where he can change into his street clothes. "This is a ‘do your job correctly, several times over, and you will likely walk away with just probation’ card."Gale nods in understanding, sloughing off the prison uni
Danganronpa: Ultimate Killing Game - Chapter 1
by Frollodacat666
Leon's been exposed for lying about forgetting his talent. The killing game has begun. Only a few people still trust Leon. Will he make it out alive in this chapter? Let's find out.
This town, Hometown
by redspah
(Deltarune Chapter 5 Weird Route Spoilers!)In the aftermath of Kris and Noelle's disappearance, the tight-knit community of Hometown is struggling to figure out what happened. The local police force, now thoroughly understaffed, is at a complete loss. They need help.And who better to help, than a pa
In The Fray
by BellaDonnaslove
When Rudy Bennett is assassinated outside Town Hall, his daughter Bonnie inherits a mayorship she never wanted, a town deep in grief, and a murder no one seems interested in solving.With six weeks until a special election and his opponent Silas pulling ahead in the polls, the last thing Bonnie needs
Luz's Bizarre Adventure (Vol. 2)
by OrphicOdyssey
A continuation of my The Owl House x Jojo's Bizarre Adventure fusion fic. This volume will cover over half of the content of season 2 of The Owl House with some additional scenes added to flesh out some of the more underutilized characters.
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About This List
This list of 25mature Mystery fanfics spans 3,534,662 total words. Kudos range from 2 on the newest entries to 24,962 on the most established. Most entries are ongoing works, so subscribe on AO3 for update notifications. The most common rating is Mature (25 of 25 fics).
Recurring tags across this list: Mystery · Angst · Romance · Hurt/Comfort · Slow Burn.
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