A Prisoner of Morro is an Upton Sinclair written under the pseudonyms Ensign Clark Fitch. It takes place during the Spanish-American War. Clif Faraday, a naval cadet, stationed on a gunboat off Cuba. He is captured while on a mission on the island and lands in a Cuban prison called Morro, renowned for its cruelty.
Upton Sinclair was a Pulitzer Prize-winning who wrote over 90 books, best known for his muckraking novel, The Jungle.