Ronia, the Robber's Daughter is a children's book by Astrid Lindgren. The story follows the adventures of Ronja, the daughter of a robber chieftain, as she grows up in the forest and befriends a boy from a rival robber clan. Together, they face danger, make new friends, and learn the value of friendship and family. Lindgren's beautiful writing and strong characters make this book a timeless classic.