Simone St. James writes fantastic historical mysteries with a supernatural twist. 'The Sun Down Motel' follows two timelines: a woman in 1982 investigating disappearances at a creepy motel where she works the night shift, and her niece in 2017 reinvestigating her aunt's own disappearance. The motel is very, very haunted, and the ghosts are active participants in the mystery. The detective work in both eras involves poring over old records and interviews, but the supernatural elements provide clues and direct danger. It's fast-paced and genuinely spooky.
My two cents: the Japanese light novel series 'Another' (Yukito Ayatsuji) fits this perfectly. A transfer student arrives in a class cursed by a mysterious phenomenon that causes students and their families to die in bizarre accidents every year. He teams up with a mysterious girl to investigate the class’s history and break the curse. It’s a classic mystery structure—interviews, research, piecing together past events—wrapped in a relentless, fatalistic horror. The anime adaptation is solid, but the novel emphasizes the puzzle-solving aspect more. The fear is systematic and inescapable, making every discovery tense.
Nick Cutter's 'The Troop' is a biological horror thriller with a strong investigative core. A scout troop on a remote island is infected by a parasitic worm. One of the boys, a science-minded kid, becomes the de facto detective, using his knowledge to try to understand the life cycle of the parasite and how to stop it. The detective work is a race against time as the horror escalates from gross-out body horror to utter primal survival terror. It's relentlessly intense and the scientific inquiry makes the horror feel terrifyingly plausible.
Honestly, I tried 'Mexican Gothic' and while it's gorgeous and atmospheric, the 'slow burn' almost went out for me in the middle. It picks up massively in the final act with some truly bizarre and eerie twists, but you have to be patient with the setting-up of the gothic tropes. The payoff is worth it, especially if you like fungal horror and critiques of colonialism.
Folk horror nails this. The clues are in the traditions, the harvest rituals, the way the old villagers won't meet your eye. The horror is the price of belonging, the ancient bargain the community has made. Solving the mystery means understanding the town's secret, and that understanding often means you're now part of the problem—or the next sacrifice. The knowledge itself is a curse.