June 2026. The Soviet Union has won the Cold War and occupies most of the former United States, now referred to as Soviet America. A fledgling American insurgency commits acts of random sabotage and sporadic bombing attacks against the Soviet occupiers and their collaborators. Two MIT professors of astrophysics, Paul deVere and former Special Operations Officer Lewis Ginter, have discovered a subatomic particle that accelerates matter to speeds faster than light, thereby opening wormholes in time. They create an Accelechron, which makes it possible to propel a human through a wormhole. Working with fellow resistance activists from New England, they develop a daring plan to go back to the early 1960s to alter the course of American history. As the time travelers scheme to avoid the watchful eyes of Soviet intelligence agents Igor Rostov and Natasha Nikitin, they find themselves increasingly distrusted by their fellow resistance leaders. When they finally make their daring attempt, they must confront not only history, but also their own pasts