With missing persons, dead bodies and a Satanist cult to deal with, both Litefoot and Jago need help. Professor Litefoot finds himself working with Jean Bazemore, an old archaeologist friend. Jago, however, finds he is assisted by someone he never even knew existed – his own son. Or is he? Can Jago be sure of anything?

But there is more to events than the detectives know. An alien menace is stirring underground. Once again, Jago and Litefoot find themselves fighting for their lives…