It was the gift of a dying civilization. Light could enter it, but no weapon known to man could penetrate its field. The Martians had given it to Koskinen because, alone among Earthmen, they trusted him. It made him the most protected man on Earth. Also the most wanted. Also the least likely to survive...|
Koskinen returned from Mars with a intelligent shield that allows in some energies like sunlight but has threshholds and bans lasers for instance so the govt decides to kill him before the enemy gets the technology.