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Summary: From a "New York Times"-bestselling author comes an interrelated thriller involving members of the Walker family, last seen in "Day of the Dead." Two murders committed generations apart resonate through three separate families, threatening to destroy them. Every summer, in an event that is commemorated throughout the Tohono O'odham Nation, the Queen of the Night flower blooms in the Arizona desert. But one couple's intended celebration is shattered by gunfire, the sole witness to the bloodshed a little girl who has lost the only family she's ever known. To her rescue come Dr. Lani Walker, who sees the trauma of her own childhood reflected in her young patient, and Dan Pardee, an Iraq war veteran and member of an unorthodox border patrol unit called the Shadow Wolves. Joined by Pima County homicide investigator Brian Fellows, they must keep the child safe while tracking down the killer. In a second case, retired homicide detective Brandon Walker is investigating the unsolved murder of an Arizona State University coed. Now, after half a century of silence, the person who can shed light on that terrible incident is willing to talk. Meanwhile, Walker's wife, Diana Ladd, is reliving memories of a man whose death continues to haunt her.