Retrofit is about the rescue ship Nightingale which is suddenly attacked and nearly destroyed - by nothing. The crew find themselves in a ship's graveyard and cannibalize the other hulls to repair their own. Having repaired many systems, they find themselves in a distant part of the galaxy when another ship falls through a wormhole - a privateer from a rival government. The Nightingale's crew must overcome their adversaries and find a way home without running out of supplies or wrecking themselves.