Tom Corbett and the intrepid crew of the Polaris race against time to recover a stolen security key that's being used to destroy all law and order within the Solar Alliance. Their mission will take the cadets undercover into the seediest planetary stopovers along the space lanes; then onward to the legendary prison asteroid known as The Rock. And finally, to a fateful encounter with a deadly band of thieves and cutthroats, where the most dangerous man alive awaits Captain Strong - to settle an old score with the Solar Guard's finest. *****This is book #3 in the Tom Corbett Space Cadet series.