God vows to send an invading army from the north to defeat the Babylonians. Verse 12 is a proto-Yo Mama joke: Your mother shall be sore confounded; she that bare you shall be ashamed: behold, the hindermost of the nations shall be a wilderness, a dry land, and a desert. After he finishes punishing the Babylonians for something he did, he'll let the Israelites go home. And he'll turn all the Babylonian men into women. I think more than a few politicians need to see that particular verse. Of course no commentary has anything to say about this clear endorsement of sex changes.
Apparently Babylon was quite the party town and people got so drunk there they all went crazy. And in the spirit of Carrie Nation, the best way to destroy it is with axes. Then let dragons in. Then turn the men into women again. And possibly rape the women. And holy shit! I did not know that I will bring them down like lambs to the slaughter (v. 40) was from the bible. I seriously thought it came from The Silence of the Lambs.
Then there's a curious incident where Jeremiah gives a copy of his book to an apprentice and tells him to read it aloud to the Babylonians, then tie a stone to it and throw it into the Euphrates River.
Another fucking retelling of the sack of Jerusalem by the Babylonians. This was already in 2 Kings, one of the Chronicles, Isaiah, and probably a dozen other places I don't recall. If you aren't familiar with it by now, reading another summary won't help, so I'm not going to re-write it.