The novel was originally serialized in five parts in the magazine Argosy All-Story beginning in April 1921.

This time, Jason brings Dr. Murray along via astral projection to Palos.

Naia is suffering complications with her pregnancy, and Jason enlists the good doctor to help.

After the birth, the child and mother are kidnapped by the Zollarians, and Croft once again uses his knowledge of earth technology to overcome the challenges he faces.

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