"Phantom Stallion" is a popular children's book series written by Terri Farley. The series follows the adventures of a young girl named Sam who forms a special bond with a wild horse known as the Phantom. Set in the Nevada desert, the stories explore themes of friendship, courage, and the connection between humans and nature. The series consists of several titles, each focusing on different challenges and experiences that Sam faces while trying to protect the Phantom and his herd. The books are well-loved for their engaging storytelling and vivid descriptions of the wild landscape, making them appealing to young readers and horse enthusiasts alike.