| Author | John Wyndham |
| First Published by | Michael Joseph Ltd |
| Publisher | Penguin Books |
| Cover/Jacket Design by | Harry Willock |
| Copyright Holder | The Estate of John Wyndham |
| Printed and Bound by | Hunt Barnard Printing Ltd |
| Format | Paperback |
| Language | English |
| Location | UK |
| Copyright | 1953 |
| This Edition Published | 1955 |
| Reprinted | 1974 |
| Pages / Font | 239 pages / Monotype Garamond |
| ISBN | 0 14 00.1075 0 |
| Price | UK 45p / Australia $1.55 / New Zealand $1.55 / Canada $1.95 |
| Chapters | Rationale
Phase One
Phase Two
Phase Three Rationale
Phase One
Phase Two
Phase Three Show all ▾ |
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