The Black Stallion Revolts: Black Stallion, Book 9 by Walter Farley (Paperback)

After the Black attacks and nearly kills another horse, Alec Ramsay decides that maybe some freedom will help calm the wild stallion. He decides to take the Black to a huge ranch out west. But when their plane crashes, Alec and the Black are separated. Alone in the desert, the Black joins a wild herd. The accident has left Alec with amnesia, and he doesn’t even know he should be looking for his horse. Will they ever find each other again