Pay dirt / Sara Paretsky.

When a young woman named Sabrina disappears without a trace in Kansas, private investigator V.I. Warshawski knows she must act fast. But when she discovers Sabrina close to death in a drug house, the locals don't take kindly to her - and Sabrina's mother becomes suspicious. V.I. finds herself under the sharp gaze of the FBI - and the men running the county's opioid distribution. And when a dead body surfaces a few days later, V.I. is pitched headlong into a battle between the locals - with roots that date all the way back to the American Civil War. The war might be over, but its legacy remains - and V.I.'s survival depends on keeping one step ahead in a game she doesn't even know she's playing.