In this twisty crime novel, a hotel hook up gone wrong finds a single mother suspected of murder

Git O'Rourke is from the wrong side of the tracks—even if, in the depressed Rust Belt town of Baxter, it's not always clear where that designation begins. A single mother, she works hard to support her daughter Charlie, but still finds time to cut loose every once in a while, to go to a local bar, drink martinis and find a companion for the night. Which is exactly how she ends up in a hotel room with a strange man passed out on heroin, and how she comes to possess the bag of money and guns that he left open as he got his fix.

When the dead body is discovered at the Skyview Motor Court, a bullet through its forehead, officer Delia Mariola is one of the first on the scene. She recognizes the victim as the perpetrator in an earlier crime—a domestic violence call—but that does little to explain how he ended up in the situation in which...