Circle of Stones

During the time of the Aztecs, a meteor-like object crashes into the jungle of early Mexico. The alien and his family survive and learn to influence the natives to their advantage. He loses a part of his ship he needs desperately.
Elizabeth Keene, eleven years old finds the medallion while on a “dig” with her archeologist father in the deep jungles of Brazil. After she is grown, she becomes an archeologist and lives in Waterbury, Connecticut. A creature looking like the grim reaper haunts her dreams.
A creature begins to terrify her and she knows the danger is real. Her life becomes a living nightmare as she attempts to find out what he wants and survive his relentless attacks on her and her friends.