Enigma Exposed — Eric Brown

Mags and Sorensen, attempting to trace the whereabouts of Pinto's rebel relative, Gregor, embark on a perilous journey across the face of the planet, pursued by Enforcers, attacked by aliens, and meeting a collection of strange humans. What they learn on the outside will make them question everything they thought true, as revelation follows revelation until the novella's showdown and the discovery of a truth which will force them to reassess everything they've ever known to be true about their home planet and the races that live there.