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. Flight Behaviour has featured on the NY Times bestseller list and is Barbara Kingsolver's most accessible novel yet.