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T. Kingfisher, .: The Hollow Places (2020)

A young woman discovers a strange portal in her uncle’s house, leading to madness and …

Solid Fantasy/Sci-Fi Horror

I have one or two quibbles here and there (there was foreshadowing of one particular thing that was heavy-handed enough to eventually start get irritated at the protagonist for not noticing), but on the whole this was incredibly enjoyable, and I immediately recommended to my mom, who got hooked on T. Kingfisher books after that.