Navigational Entanglements. Aliette de Bodard

The Navigator clans have always been responsible for the safety of ships in the Void. These faster-than-light regions of space are inhabited by mysterious and dangerous creatures called the Confusionists. So when, for the first time in the history of navigation, the Confusionists manage to infiltrate the human world and escape, only the Clans can stop them. On this mission, they send four rookie outsiders who are easier to kill than to get along with. But after the death of the Imperial envoy, the leader of their team, they will have to learn to work together - and quickly, before the Confusionists destroy hundreds of civilians, and at the same time the fragile reputation of the Clans.