The Cambridge Companion to the Modern Gothic
Strangely disappointing - I was looking forward to a decent treatment of SFF texts that don't get much academic attention, but with the exception of one essay ("Modern Gothic and the law") most of the fourteen pieces in here read like lists of tropes and plot summaries without any really detailed analysis.
Also, the essay on Asian Gothic is full of statements like "Asian literature contains lots of work on the themes of madness, the supernatural, political oppression, espionage, the oppression of women and murder" (not an exact quote because I'm at work and don't have the book in front of me) as if a) we are supposed to be surprised by this and b) this told us anything about Asian literature that didn't also pertain to Western literature.
Might be useful as a suggestion for topics for further exploration, but as an end in itself it's just too reductive.