This novel is published both as a singleton and in the omnibus edition Across Realtime together with the sequel Marooned in Realtime.
The “Peace Authority” has stopped war by encasing warring factions in impenetrable force fields known as “bobbles” created by the “Bobbler”. Then all high technology was banned. Fifty years later, the inventor of the Bobbler leads a revolution.
Vinge skillfully describes the human condition in this very odd future world. While most humans are poor, the Peace Authority has set itself up as a sort of benevolent dictatorship, but it has stagnated technologically. The Tinkers, under the ad-hoc leadership of Paul Naismith, inventor of the Bobbler, have advanced electronics well beyond those of the Authority. The Authority’s blind spot is that it cannot believe the Tinkers are so advanced when high energy applications are banned.
There is a little of everything here. A coming of age story, love lost and hope for its resumtion, honor, loyalty, betrayal. Vinge uses the plot device of the bobbler and the bobbles to great effect, and meticulously exhausts the implications of the technology’s effect on humanity.