Station Eternity by Mur Lafferty

Mallory Viridian's talent for solving murders ruined her life on Earth and drove her to take refuge on a sentient space station. At first the new existence is peaceful and devoid of homicide, offering a break from the suspicion that followed her. When the station allows human guests and the first Earth shuttle arrives, aliens and humans begin to die; Mallory is stuck in the center of an extraterrestrial whodunit and must solve the crime quickly or risk more victims aboard.

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