Riverworld is a science fiction novel by Jerry Pournelle that takes readers on an extraordinary journey through an enigmatic afterlife. The story begins with the sudden awakening of billions of people from various time periods, all finding themselves in a mysterious and seemingly endless river valley. This river valley is home to an intricate river system that spans the entire planet, with each person mysteriously resurrected at a specific age and location along the riverbanks. As the characters navigate this strange new reality, they encounter various challenges, including hostile tribes, dangerous animals, and the constant search for answers about their bizarre circumstances. The protagonist, Richard Francis Burton, a famous explorer from the 19th century, becomes the catalyst for unraveling the secrets of Riverworld. With the help of other resurrected historical figures, including Mark Twain and Hermann Göring, Burton sets out on a quest to uncover the truth behind their existence and find a way to escape this perplexing afterlife. Throughout the novel, Pournelle masterfully explores themes of redemption, exploration, and the nature of human existence. Riverworld is a captivating and thought-provoking tale that keeps readers enthralled until its surprising and satisfying conclusion.