When a pair of star-crossed lovers arrange to meet in Arizona's fabled Skeleton Canyon, they set in motion a chain of deadly events. Summoned to investigate, Sheriff Joanna Brady finds herself faced with echoes of Tombstone's infamous Clayton gang while dealing with an unfolding grisly family tragedy in which murder is only the most obvious crime committed. Under the unforgiving Arizona sun, as an evidence-destroying thunderstorm stalks the barren desert canyons, time is running out and Joanna must finally prove she's got what it takes no matter the cost. Because in the desert, a gunshot may not make a sound if there's no one else around to hear it. . .