Rarely do books have such a great influence on a genre as Lest Darkness Fall has had on science fiction.
An indication of the influence and longevity of the book is by the number of best-selling writers who have Written stories in direct response to, or influenced by, Lest Dark.
Sprague de Camp helped establish alternate-history as solid sub-genre of science fiction.
Frequently quoted as one of the favorite books of many of the masters in this genre, this book by L.
Rarely do books have such a great influence on a genre as Lest Darkness Fall has had on science fiction