“Smart and punchy” new book ‘Disaster movies’ has four exclamation points in its title, so I’ve gone one better. Anne Billson unravels Buffy the Vampire Slayer’s magic and examines her antecedents and influences. ‘Getting Lost’ collects essays on the hit TV series from people such as science-fiction writer Adam-Troy Castro and paranormal-romance author MaryJanice Davidson. Want more new movie books? Check out our movies page.