There is a world dying from the heat of the sun. There is a world dying from the cosmic cold. And there is our world - the battlefield between cold and heat. There is only one way to return ice and flames to a state of equilibrium - to destroy an opponent: jumper saboteurs, whose genetics allow them to move between parallel spaces, converge in a deadly battle on the streets of earthly cities. The writer Denis Davydov and his wife Karina never heard of Parallels, but became soldiers in someone else's war.