She's been exiled to Basilisk Station in disgrace and set up for ruin by a superior who hates her. Her demoralized crew blames her for their ship's humiliating posting to an out-of-the-way picket station.
The aborigines of the system's only habitable planet are smoking homicide-inducing hallucinogens. Parliament isn't sure it wants to keep the place; the major local industry is smuggling; the merchant cartels want her....