I'm reading two. I don't normally read two at time, but since one is a film book, it's easy for me to go back and forth between the two.

Regional Horror Films 1958-1990: A State By State Guide With Interviews
Thank you to Psychobeatnik for making me aware of this. Really interesting read, there's films in here I've never heard of.

Guy N Smith's Bats Out Of Hell British killer bats book. It's a fun little read. Bats infected with virus are loose in England, biting people, and turning them into foaming mouthed psychos.