"Le Sipehuz" is a science fiction novel by father and son - Joseph-Antoine and Henry Rozny. The book tells the story of an alien race that is forced to mine minerals on Earth. The main characters are two people who communicate with these alien beings and try to reveal their secrets. In an atmosphere of mystery and danger, they risk their lives to learn more about the mysterious Xipéhuz. This book fascinates and makes the reader think about the place of man in the cosmos and the possible forms of life in it.