(From the publisher):
The eerie battle that soldier of fortune, Eric Nelson, waged in the name of humanity was unlike any he had fought before. Deep in the hidden Valley of Creation, Nelson fought valiantly and successfully against weapons that included centuries-old magic and superstition. But then a day arrived when Nelson faced the acid test: he learned that more than just humanity was at stake...and he discovered the devastating alien secret that lay buried in the Cavern of Creation!
Original title: The Valley of Creation
Genre: Fiction→ Science Fiction→ Adventure