There's an afterword in
The Mammoth Book of Locked-Room Mysteries and Impossible Crimes, where the editor (Mike Ashley) talks a little about the history of the subgenre. He mentions
The Murders in the Rue Morgue by Edgar Allan Poe, and refers to it as "
grotesque and bizarre". I'm now on an
'impossible crimes' kick and I want to try
The Murders ... but I wondered what was meant by "
grotesque and bizarre". Is it horror? Are there supernatural elements? Are the murders overly graphic? I would appreciate some insights (without getting too spoiler-y

). Thanks!