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Detective Rio Vidal catches the case of a serial killer in New York City. The crime scene is staged like the murder scenes from the famous Witch Killer books written by Agatha Harkness. Wanting to help solve the case and provide insight the writer offers to work with the detective to find the killer. The two make an unlikely pair, constantly butting heads and fueling the underlying tension.
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I ain't letting up (until the day I die) by up_to_some_good
Fandoms: Harry Potter - J. K. Rowling
21 Dec 2025
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Sirius Black: billionaire writer, beloved by many, bored. His latest novel has just launched and is already a bestseller, but he's looking for something new - a muse that will keep his attention. Enter Remus Lupin, a detective who needs a lead in his father's murder and several cups of coffee. When Sirius meets him, he's immediately inspired. Sirius becomes a consultant to the detective and helps him solve crimes around the city while writing his next novel. Remus, reluctantly, starts to like the charming author and confides in him. Can Sirius help him solve the case that has plagued his entire career? And can he avoid falling for him in the process?
Or
Castle (TV) AU where Remus is Beckett, Sirius is Castle, and everyone else is just along for the ride.
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Heaven and hell were words to me by princessconsuelacrapbag for adina_rachelle
Fandoms: The Rookie (TV 2018)
29 Nov 2025
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When a bank robbery goes sideways, Tim finds himself hostage alongside Genny as Lucy's thrown into the middle of the entire operation that works to get them and the others out before they run out of time. (Season 5 AU, inspired by Castle 4x07).
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Manon Bannerman, 21 (23, she’s lying.), is a successful crime author. Just finishing one of her many best selling series- she’s riding the high of being famous, smiling for the camera and signing a whole lot more than just books. She’s also running from the deadline of a new release that was supposed to be due 9 weeks ago. Bored and plagued with writers block, what else could she do except party, drink champagne and flirt with people?
Sophia Laforteza, 22, is a stone cold, intelligent, ‘Let’s get this over with’ detective for the LAPD. Solving crimes with hard work, determination and just a bit too much matcha to be considered healthy, she- along with her coworkers- are assigned to a… familiar looking case.
Will Manon be able to find something to light her spark, and thus end her writers block? Maybe.
Will Sophia be able to solve this case, with peace and quiet? Definitely not.OR
Castle but make it Katseye (Katsle, if you will hehe)
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Richard Castle is an opinion columnist fresh out of ideas until he stumbles upon new inspiration—Katie Beckett, aka the "Runaway Bride." But when she gets him fired for getting his facts wrong in an article about her, he embarks on a mission to prove that he's right—that she's going to run from her next groom yet again. A co-authored story by mysterymuse and katics.
Series
- Part 4 of Rom-Com Crossovers
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Cuando una pintura de un artista psíquico es robada, la detective Enid Sinclair se enfrenta a un caso sin pistas claras. Todo cambia con la llegada de Sydney Waden, una escritora con visiones inquietantes y motivos propios. ¿Será esta colaboración la clave para resolver el crimen casi perfecto?
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Wenclair Week
Día 4. Policía/Ladrón
Series
- Part 4 of Wenclair Week 2024
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Whumptober 2025
Day 1 - "Please Don't Cry" / Lamb to Slaughter
Bones goes undercover to find their latest unsub.
Series
- Part 1 of NatK - Whumptober 2025
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Buck & Eddie get stuck in a walk in freezer, face death & come to terms with it, and get a love confession out of it.
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Todd Anderson is a bestselling crime novelist. After publishing his third novel, he’s grown tired of writing murder mysteries. With the encouragement of his editor, he decides that his next novel will have mysteries of a different sort: medical mysteries. Trouble is, he doesn’t know anything about medicine.
Dr. Neil Perry is an oncologist who, quite frankly, is bored with monotonous day-to-day work. Not even his favorite crime novels can keep his boredom at bay. So when his boss tells him that a famous novelist is going to be shadowing his work for research, he’s happy to help out!
Or; to research his new novel, Todd shadows Neil's work. What could go wrong?
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An old friend of Hermione's is mixed up with the murder of a high-end chef—and with Ron.
Series
- Part 7 of Partners in Crime
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Westview had always been a quiet, friendly and peaceful little town. But all this changed the moment a lifeless body was found at the entrance of the town.
Everything changed when the police received a call they hadn't received in years: a murder had been committed in Westview.~~~
Agatha Harkness returns to investigate a murder eight years later.
Will her years as a New York City detective help her solve the case?
She may need the help of her ex-lover, ex-coworker and bestselling writer, Rio Vidal. Now, a memory buried in the past. -
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When it all feels dark in the detective’s life, the sun shines brighter than ever when a charismatic writer appears in his life. James is a writer, Regulus an inspector. What could ever happen when someone copies the way James kills his characters in his books and uses it to kill someone in real life?
Or just a marauders AU based on the TV show Castle (2009).
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She gasps, "Kara!"
"What?"
"This bank is about to get robbed!"
"What."
Or, a self-indulgent Morgadec rewrite of one of my favorite Castle episodes.
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all that you rely on by alyaasca, blueberriesandcream
Fandoms: Red White & Royal Blue - Casey McQuiston
04 Oct 2024
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Acclaimed mystery novelist Alex Claremont-Diaz is fresh off his latest bestseller and lacking inspiration when Detective Henry Fox brings him in for questioning about a murder. Suddenly, Alex has all the inspiration he needs for a brand-new set of books and Henry has a brand-new and unlikely tagalong. (and maybe, eventually, something much more.)
or, the Castle AU.
COMPLETE AS OF 10/5/24
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Cuffed by BensonBabe1999
Fandoms: Law & Order: SVU, Law & Order: Organized Crime (TV 2021)
08 Aug 2024
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Olivia and Elliot wake up handcuffed together.
"Damnit," Olivia mutters, trying to pull her hand free again. The realization sinks in – they are handcuffed together. "Well, this isn’t triggering at all."
"That’s not funny, Liv," Elliot mutters, a mixture of disbelief and annoyance on his face. He tugs at the cuffs, testing their strength. "How the hell did we end up in this situation?"
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The date had gone well. Or, at least, she thought it had.
AKA - the one where Emily avoids talking to Aaron as a result of a miscommunication and she manages it...right up until an unsub locks them in a freezer.
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Ron and Hermione go undercover at Malfoy's Winter Ball to catch a killer.
Series
- Part 9 of Partners in Crime
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An unusual witness sparks a disagreement between Ron and Hermione about the existence of soulmates.
Series
- Part 8 of Partners in Crime
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Sergio Perez is a homicide detective married to his work, immersed in the cases that come in so as not to think about his own life. Nico Hülkenberg is a detective who comes to cause a revolution in the precinct accompanied by his "apprentice" the young narcotics detective Max Verstappen.
Secrets, falling in love, seeking revenge and solving cases.
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When a vampire is found murdered in London, Ron and Hermione team up with the Muggle police to solve the case.
Series
- Part 3 of Partners in Crime