SUSAN HAMILTON embarks on a normal journey into London to visit her parents and winds up encountering violence and destruction on an unbelievable scale. Aliens have emitted an ultrasonic ray over London that reduces the local population to a basic level of survival; kill or be killed.Finding her parents dead, and meeting a policeman, Peter Knowls, they embark on a dangerous mission to stop the aliens from taking control of Earth and its species. As she fights her way across London, she encounters the aliens and learns to become telepathic, expanding her awareness and capabilities to fight back and save the world!