Exile's Burn by Elaine Corvidae

The Zatvian Cooperative has conquered all of known space, destroying the world of Harvest in the process. For Neva Whitestone, a native of Harvest who was injured in the final battle, those years have been spent in a hospital, recovering from her wounds. Now Neva has received a mysterious summons from the captain of a ship called the Exile. Neva’s aunt has died, leaving a crew vacancy that she is expected to fill. The Exile is no innocent freighter, however, but instead a pirate ship embroiled in the last vestiges of rebellion against the Cooperative.

But Neva isn’t the only new person on board the Exile. A stowaway has crept inside, whose ravaged brain may hold secrets the Cooperative would kill to learn.