"The Phantom Stallion Series" is a collection of children's novels written by Terri Farley. The series follows the adventures of a young girl named Sam and her bond with a wild horse known as the Phantom. Set in the Nevada wilderness, the stories explore themes of friendship, courage, and the connection between humans and nature. The series consists of several books, each featuring different challenges and experiences that Sam faces while trying to protect the Phantom and his herd. The engaging narrative and vivid descriptions make it a popular choice for young readers who love animals and adventure.