Across a string of cases set in early-twentieth-century America, a federal investigator is dispatched wherever local boundaries give criminals room to operate. A moonshine network in rough country, confidence schemes in growing cities, and border-side rackets all demand the same thing: evidence that will stand when money and intimidation close in.

Each episode follows the slow, methodical work—cultivating informants, testing alibis, tracking documents, and laying traps that rely on patience more than force. The stakes rise as well-placed figures try to redirect blame and erase paper trails, turning every lead into a question of timing and proof. The result is a brisk, procedural-minded detective book built around cases that widen from one suspect to an entire system.