"The flames now appeared to lift from individual treetops in showers of orange sparks, exploding the way a pine log does in a campfire when it is poked. The sparks spiralled upward in swirls like funnel clouds. Twisters of brightness against grey sky." 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.