On a poisonous planet where humans live side-by-side with an alien race known as the halion, one investigator just wants to live a peaceful life. Reagen Thorpe enjoys her solo life as an Investigators, Inc. employee, with the freedom to choose her cases and how she wants to run them. But when a dangerous drug known as Ash floods the city levels, Black Corporation calls on her to clean up the mess. With the mob as her sponsor in Roen, she has no way to refuse. Now, saddled with an unwanted partner, she risks her life to hunt down the drug smugglers before more bodies pile up.