The Peace Authority conquered the world with a weapon that never should have been a weapon--the "bobble," a spherical force-field impenetrable by any force known to mankind. Encasing governmental installations and military bases in bobbles, the Authority becomes virtually omnipotent. But they've never caught Paul Hoehler, the maverick who invented the technology, and who has been working quietly for decades to develop a way to defeat the Authority. With the help of an underground network of determined, independent scientists and a teenager who may be the apprentice genius he's needed for so long, he will shake the world, in the fast-paced hard-science thriller that garnered Vinge the first of his four Hugo nominations for best novel.

    Two unlikely heroes are destined to oppose the malign forces that threaten their lives and the survival of their world.

    Named an ALA Best Book for Young Adults, Cat's story has been continued by Hugo-award winning and international best-selling author Joan D. Vinge with the very popular Catspaw and Dreamfall. Now, 25 years later, this special anniversary edition of Psion contains a new introduction by the author and "Psiren," a story never before included in any trade edition of Psion. This tough, gritty tale of an outsider whose only chance for redemption is as an undercover agent for an interstellar government that by turns punishes and helps him, is as fresh and powerful today as it was in 1982.