The most fearsome summon: Dire Administrator
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I'm sure I read The Fall of the House of Usher at some point, but I didn't retain enough that I had any particular expectations for the direction of the plot, etc.
However, I did read Mexican Gothic relatively recently, so I spent a good deal of What Moves the Dead, once the overall shape of the story became apparent, nodding along and waiting for the characters to catch up - it gave me a chuckle to see the reference to Mexican Gothic in the author's note.
Great writing, an intriguing reimagination of the classic.
There were a lot of scenes I loved, and the sequence in the beginning where the narrative is passed along a chain of serially coinciding characters is wonderful. When I read the reunion near the end, I literally exclaimed "Hahaha, yes!" As a whole, it felt a touch rambly, but I have no regrets. One area where Tchaikovsky excels is departing from (or maybe just ignoring?) genre tropes, and this is no exception.