Fiction

Arkham Asylum: A Serious House on Serious Earth by Grant Morrison & Dave McKean
Arkham Asylum is one of the most acclaimed Batman books ever written -- for one example, it came 4th on IGN's 25 Greatest Batman Graphic Novels -- and, as the blurb on the 15th anniversary edition proudly proclaims, is still "the most successful graphic novel of all time" (I took that to mean best-selling, but upon re-reading it's obviously completely vague). It's certainly unlike any other Batman book you will ever see; in fact, it's hard to believe something so unusual was ever released by a mainstream publisher; even more so that they allowed it to be about one of their most popular creations. It's very dark, very bleak, very dense, and, despite its wide-spread high acclaim, is surely an acquired taste.
The 15th anniversary edition (it seems like this was only recently released still, but Arkham will be 20 next year!) includes Morrison's complete original script, plus new annotations. It's hard to believe people got by a decade and a half without this, as his comments in the original script explain so much, and his new notes flesh out many bits further. I haven't read it through in full yet, but did refer to it on multiple occasions while reading the graphic novel, and will unquestionably be reading it properly at some point.

Double or Die by Charlie Higson
Chapter 16