When suddenly all the fissionable material on Earth was exploded, Earthmen had their first notice of the aliens' arrival.
And by the time the panic, death and chaos had been sorted out, reports were coming in about mysterious cities scattered across the face of the planet - huge areas of flickering light and awesome free energy, disorienting to human senses and impregnable to attack.
The question was: were they alien bases . . . or something else?
- ISBN10 0575101571
- ISBN13 9780575101579
- Publish Date 18 March 2013 (first published 10 March 1985)
- Publish Status Active
- Publish Country GB
- Publisher Orion Publishing Co
- Imprint Gateway
- Edition Digital original
- Format eBook (EPUB)
- Pages 320
- Language English