It had happened before. Burnt Mountain, Alaska. Novosibirsk, Siberia. Now it is about to happen to a thriving city. A city with a population of 1.3 million people, all of whom will be wiped out in a blink. Unless it can be stopped. Teenagers Tane Williams and Rebecca Richards hold the key to stop the destruction. A message from the future. Instructions that cannot be ignored. Tane and Rebecca must act - and fast. The survival of the human race depends on it.