Part One: A strange light blinks on Venus, and over old Earth hovers a mysterious visitant-dread harbinger of Interplanetary War. Part Two: It is war. Interplanetary War. And on far-distant Venus two fighting Earthlings stand up against a whole planet run amuck. Part Three: Two fighting Yankees-war-torn Earth's sole representatives on Venus-set out to spike the greatest gun of all time. Part Four: From Earth and Sub-Venus converge a titanic offensive of Justice on the unspeakable Man-Things of Torg. This book originally appeared as 4 3-part serial in Astounding Stories of Super-Science in November and December 1930, and January and February 1931.