This was really, really hard and I cheated at a lot and the number of fic I still had to leave out is heartbreaking. Basically you get two top sevens (in no particular order), one for WIP and one for completed. I tried to limit myself to one per author (sort of successfully if you only look at one category at a time and ignore honorable mentions).
This is kind of long so the recs are under the cut:
I’d love to be in a wintery, witchy fairy tale. My home would be an old quaint castle hidden in the forest, I’d be the young witch of the woods villagers would brave traveling to for tinctures, cures, and spells for ailments. And I’d always be known as kind, but very dangerous.
Cats are the guardians of the underworld. Humans took cats in to manage pests, but cats believe this includes supernatural pests. At night cats protect against malicious spirits and send them back to hell.
Poirot’s chief personality characteristic was undoubtedly his overweening - but lovable - egotism. On rare occasions he would present an appearance of modesty, but it was patently so forced and false that it fooled no one. Some of his own evaluations from one story or another: “Hercule Poirot… is of a cleverness quite exceptional;” “impossible to deceive Hercule Poirot;” “me, I know everything.” - Russell H. Fitzgibbon, The Agatha Christie Companion