The dense Wind River Mountains of western Wyoming is where Carlson (Five Skies
) sets his brooding latest, a tale of expired love and desperate measures. Mack, son of a longtime rancher, has made many missteps in life, culminating in a recent stint in jail where “he'd rusted like an old post when the weather turned.” While he's in jail, his recently ex-wife Vonnie agrees to join him one last time on their annual ritual of backpacking through the Wyoming wilderness to fish, camp and rediscover each other. Mack, though, has a hidden motive: a friend/technical genius has hired him to retrieve a valuable drone that's crash-landed in the forest. Carlson describes the couple's six days wandering the wooded terrain in delicate, measured prose, careful to miss neither the lush scenery nor the incrementally amplified tension as Mack edges closer to his prize and shady characters from the past appear. Carlson has produced a work of masterful fiction, combining the sad inevitability of a doomed relationship with sheer nail-biting suspense. (June)