What Moves the Dead, by T. Kingfisher

A creepy read for Halloween night, this novella is based on Edgar Allen Poe's "The Fall of the House of Usher".
Retired soldier Alex Easton is visiting childhood friends Madeline and Roderick Usher. With Madeline dying, both twins losing their minds, and strange occurences on the property, Alex must uncover the secrets of the House of Usher before it is too late.