Lest Darkness Fall

Science Fiction by Lyon Sprague de Camp

Blurb

Lest Darkness Fall is an alternate history science fiction novel written in 1939 by author L. Sprague de Camp. The book is often considered one of the best examples of the alternate history genre; it is certainly one of the earliest and most influential. Alternate history author Harry Turtledove has said it sparked his interest in the genre as well as his desire to study Byzantine history.