An area of northern England has been acting as a portal between this and a different, near-parallel dimension. Susceptible people can use the instability in the space-time continuum, calling it going through the Mirror. Discovering two susceptibles, Jed and Gail, old-hand Therese recruits them to join her as an agent of the rebels who are trying to bring down the regime on the other side of the Mirror. Once through they discover not one, but at least four interlaced dimensions, people with emanations and a nightmare totalitarian government. Dissidents are disappeared or hunted as quarry with dogs, nobody knows whose side anyone is on, rules govern everything and the country is racked by earthquakes. But because they can ride the shifts in the continuum Jed and Gail are immune to the fear that grips the majority and soon become successful agents. Before the end, however, Chaos Theory comes into play and those who don’t understand Schrödinger’s Cat have to get a grip on it very quickly.