A captivating, topical and deeply human story touching on class, poverty and climate change by the award-winning, global bestselling author of Demon Copperhead and The Lacuna

On the Appalachian Mountains above her home, a young mother discovers a beautiful and terrible marvel of nature: the monarch butterflies have not migrated south for the winter this year. Is this a miraculous message from God, or a spectacular sign of climate change. Entomology expert, Ovid Byron, certainly believes it is the latter. He ropes in Dellarobia to help him decode the mystery of the monarch butterflies.