Covers: Open Library
Covers: Open Library

The book depicts the arrival of members of an alien species called the Fithp that have traveled to the Solar System from Alpha Centauri in a large spacecraft driven by a Bussard ramjet. Their intent is conquest of the planet Earth.
| Format | Publisher | Year | ISBN |
|---|---|---|---|
| Paperback | Del Rey | 1997 | 9780345418425 |
| Edition | Orbit | 1988 | 9781857230970 |
| Edition | Little, Brown Book Group Limited | 1988 | 9780708883761 |
| Edition | Sphere | 1986 | 9780722163399 |
| Paperback | Del Rey | 1986 | 9780345323446 |
| Edition | Gollancz | 1985 | 9780575036901 |
| Edition | Ballantine Books | 1985 | 9780345323477 |
| Paperback · spa | — | — | 9788498002881 |
| Paperback · spa | — | — | 9788498002638 |