The New York Times bestselling author of Ordinary Grace weaves a vivid and pulse-pounding thriller that follows Cork O'Connor's search for a missing man amid the fraught tensions at the border between Arizona and Mexico.

On the Fourth of July, just as fireworks are about to go off in Aurora, Minnesota, Cork O'Connor and his new bride Rainy Bisonette receive a desperate phone call from Rainy's son, Peter. The connection is terrible but before the line goes dead, they hear Peter confess to the murder of someone named Rodriquez.

The following morning, Cork and Rainy fly to southern Arizona, where Peter has been working as a counselor in a well-known drug rehab center. When they arrive, they learn that Peter was fired six months earlier and hasn't been heard from since. So they head to the little desert town of Sulfur Springs where Peter has been receiving his mail. But no one in Sulfur Springs seems to know him. They do, however, seem to recognize the name Rodriguez. Apparently, the Rodriguez family is one of the cartels controlling everything illegal that crosses the border from Mexico.

As they gather scraps of information about Peter, Cork and Rainy are warned time and again that there is a war going on along the border. Trust no one in Coronado County, is the most common piece of advice they receive, and Cork doesn't have to be told twice. To him, Arizona is alien country. The relentless heat, the absence of water and big trees and shade all feel nightmarish to him, as does his growing sense that Rainy might know more about what's going on than she's willing to admit in this fresh, exhilarating, and white-knuckle mystery starring one of the greatest heroes of fiction.