Things heat up in the 11th Ward as the CCG investigates the high rate of investigator deaths. Kaneki has an explosive run-in with Aogiri Tree, essentially a Ghoul Gang, run by a Ghoul known only as the One-Eyed King.
The story in the manga is way better than the anime. I'm not saying the anime is terrible but the manga really digs in. I recommend Tokyo ghouls all the way.