De Camp touches briefly on a future when nearly every big game animal is near extinction, and the few remaining ones live in protected parks. That Rivers has been a part of the killing of scarce wild animals is unlikely to endear him to people who are concerned about the modern world's rapid and ruthless destruction of its natural environment. That he takes his deadly skills to ancient eras may also trouble some people. Other than these points there is little in the story that is socially sensitive. The characters are handled well, even if somewhat stereotypically, and no colonial prejudice is evident in Rivers's attitude toward his business partner Aiyar, who is presented with dignity and respect.