Fallen Angels, Watchers, Giants, Nephilim and Evil by Dr A. Nyland
Approx. 32,080 words.
Published on May 11, 2011.
This easy-to-read book has full scholarly notes. Watchers, a class of angel, taught skills to humans and some slept with human women, the resultant progeny being Nephilim. For this they were thrown into Tartarus. Greek mythology speaks of "gigantes" (the Greek word for Nephilim) being thrown into Tartarus. Idioms such as the mistranslation "sons of God," are explained fully.