Another side story, this time concerning the prisoners that the Belters captured from the original Protogen project in Leviathon Wakes.
All the prisoners have been put into one large room and are continuously watched over from above by the Belters who guard them. For them, after their crimes, there is no future, nothing at all, beyond the walls of this room.
And then, one day, or night, the man from Mars turns up and begins to offer hope, if only to one of them, but which one will it be?
A really good novella, that can be read as soon as the Belters have taken them prisoner, or anytime thereafter.
Next up in the series is Cibola Burn.