"The ___ Next Door" (second book in Lisi Harrison's "Monster High" series) (5)

I believe the answer is:

ghoul

(Other definitions for ghoul that I've seen before include "Gruesome fiend" , "Macabre fiend" , "malevolent spirit" , "Morbid type" , "Evil presence" .)

I've seen this clue in The Washington Post.

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