"Heidi" is a classic children's novel written by Johanna Spyri in 1880. The story follows a young girl named Heidi who is sent to live with her reclusive grandfather, Alm-Uncle, in the Swiss Alps. The novel explores themes of nature, family, and the importance of home. As Heidi adapts to her new life in the mountains, she befriends Peter, a goatherd, and brings joy to her grandfather. However, her life changes when she is taken to Frankfurt to care for Clara, a disabled girl. The story highlights Heidi's resilience and the power of love and friendship.