The Nightingale by Kristin Hannah

Set in France during World War II, The Nightingale tells the story of two sisters, Vianne and Isabelle Rossignol, who are polar opposites yet bound by family and survival. As the German army invades, Vianne must bid farewell to her husband and learn to live under the enemy’s control—risking everything to protect her daughter. Her younger sister, Isabelle, fiery and rebellious, joins the Resistance and becomes “The Nightingale,” a secret operative who leads downed Allied pilots across the perilous Pyrenees mountains.