By Paul Ernst

CHAPTER I

The Red Spot

CHAPTER II

The Pipe-like Men

CHAPTER III

The Coming of Greca

CHAPTER IV

In the Tower

CHAPTER V

The Torture Chamber

CHAPTER VI

The Inquisition

CHAPTER VII

In the Power-House

CHAPTER VIII

Tremendous Odds

CHAPTER IX

Into the Enclosure

CHAPTER X

The "Tank Scheme"

Transcriber's Note:

This etext was produced from Astounding Stories October 1931. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.