My Review: I came into this one kind of expecting Cash and Gravity to both be people. Literally. I was expecting those to be the names of the protagonists. Let me disabuse you of that notion right now, because they’re not. Instead, they are the forces that power the narrative of the story. Gravity, the force of nature. The principle that Earth, or any large mass, pulls things towards it from space. Like lifeboats ejected from dying spaceships. And dropships built to drop from orbit with a cargo of space marines.