The Churn tells the early backstory of Amos Burton, one of our heroes on the Rocinante in Leviathan Wakes and onwards. It is set in the criminal substrate of future Baltimore. Large parts of the city have been submerged by rising sea levels, and it is in general a crappy place to live; a backwater that no one cares very much.
The apathetic attitude of the denizens of Baltimore, and by implication much of Earth, is well portrayed. Most are living on Basic, a sort of dole where they get free (bland) food and basic services but do not have to work. Many are unregistered and have no real identity in the eyes of the authorities. They live their lives without purpose or hope for a better future. And they look upwards at Mars and the Outer Planets with a dreamlike wonder, knowing that they are very unlikely to have a chance at a better tomorrow up there.