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A violent
explosion in space which wreaks havoc with world communications and defense
systems touches off one of the most thrill-packed adventures in Tom Swift’s
scientific career.The appalling news that a cargo rocket has disintegrated
while en route with vital supplies to Earth’s second moon, the asteroid
Nestria, sounds a grim warning that the lives of Nestria’s personnel are at
stake. A rescue mission is foiled by a mysterious barrier in space -- an
invisible wall capable of turning anything it touches to raw energy! Warned of a
determined enemy, the Black Cobra, Tom and Bud receive help by an unknown group
and clues that lead them to a fantastic antimatter mine in Africa, and to
captivity and the threat of death in the Cobra’s fortress in South America. The
news that the Nestria colonists have contracted a contagion of unknown origin
leads the young inventor, armed with his magnetaser invention, into a desperate
battle of wits and courage to win back Nestria from the ruthless asteroid
pirates!