About the Book
The first Agrav ship ever built was named Jovian Moon. It would bring
the stars into man's reach, but Sirian sabotage threatened to snatch
the prize from Earth.
Lucky Starr, officer of the Council of Science, had a job to do: find
the traitor who was transmitting the information to the Federation's
Sirian enemies.
Nearly a thousand men made up the personnel of the project. But one of
those men was a Sirian robot spy – a robot spy who heard everything,
saw everything, knew everything.
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