The Eyre Affair: a Novel ; Jasper Fforde; 2001

The eventual "solution" to defeating Acheron's supernatural protections is weak, and there are certain sections of the book where the narrative drags, but Fforde otherwise delivers an incredibly enjoyable read full of "high culture becomes pop culture" references and the jaw-dropping "Rocky Horror Richard III Show".

Note: posted on 5/8/2013, backdated to when I actually read the book.