This topic from Long and Short Reviews was an interesting one, because it's been a while since I read anything that could be considered to be explaining something. But I do love film, and I recently found two books that are a great addition to any film lover's collection.
Men, Women and Chain Saws - Carol J. Clover. All about the treatment of men and women in the horror industry, and an excellent in-depth read for a horror lover like me.
The Science of Interstellar - Kip Thorne. For anyone (like me) who loved the film but found the science a little complicated, this is an accessible read which goes into the background and explains it perfectly.
So which books would you recommend?