Far from the Light of Heaven by Tade Thompson

The colony ship Ragtime docks in the Lagos system, having traveled light-years to bring one thousand sleeping souls to a new home among the stars. But when first mate Michelle Campion rouses, she discovers some of the sleepers will never wake.

Answering Campion's distress call, investigator Rasheed Fin is tasked with finding out who is responsible for these deaths. Soon a sinister mystery unfolds aboard the gigantic vessel, one that will have repercussions for the entire system—from the scheming politicians of Lagos station, to the colony planet Bloodroot, to other far-flung systems, and indeed to Earth itself.