Record of a Spaceborn Few von Becky Chambers

Centuries after the last humans left Earth, the Exodus Fleet is a living relic. Humanity has finally been accepted into the galactic community, but not everyone has left for alien cities. When a disaster rocks this already fragile community, the Exodans who still call the Fleet their home can no longer avoid the inescapable question: What is the purpose of a ship that has reached its destination? "The best speculative fiction currently being written". John Connolly.