Amid a starkly beautiful but uncanny landscape in New Mexico, a married couple from Cambridge, MA takes residency at a distinguished academic institute. When the husband is stricken with a mysterious illness, misdiagnosed at first, their lives are uprooted and husband and wife each embarks upon a nightmare journey. At thirty-seven, Michaela faces the terrifying prospect of widowhood - and the loss of Gerard, whose identity has greatly shaped her own. In vividly depicted scenes of escalating suspense, Michaela cares desperately for Gerard in his final days as she comes to realize that her love for her husband, however fierce and selfless, is not enough to save him and that his death is beyond her comprehension.