The classic time traveler novel. No publication date or ISBN. Probably a book club edition? Lest Darkness Fall is an alternate history science fiction novel writtrn in 1939. The book is often considered one of the best examples of the alternate history genre; it is certainly one of the 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. Securely shipped in cardboard, not a bubblewrap envelope.