A scientist brings a device to Earth which shields the wearer from any known weapon. Soon he is on the run from every military power on Earth....including his own!
March 1982 : USA Mass Market Paperback
September 1974 : USA Mass Market Paperback
1970 : USA Paperback
July 1969 : UK Paperback
September 2011 : UK Kindle edition
Author(s): Poul Anderson
Availability: Amazon UK