Stina Leicht’s 2020 Persephone Station is a standalone science fiction novel.
The United Republic of Worlds would give legal status to aliens like Persephone’s enigmatic inhabitants. Maybe so, but the self-styled Emissaries prefer to remain private and hidden. Accordingly, they have traded certain services to Vissia Corsini in exchange for Corsini using her de-facto control of the Serrao-Orlov Corporation’s local branch to conceal the Emissaries’ existence. They have also permitted the corporation to claim ownership of their world. From the Emissary standpoint, that doesn’t seem like a problem; thanks to Emissary misdirection, humans believe they can’t survive unprotected on Persephone.
The services they gave Corsini turned out to have an unfortunate catch. Corsini is pissed off and decides to take revenge. Her advantage: she controls Serrao-Orlov’s resources on Persephone and can certainly figure out ways to make the Emissaries regret their bargain.