The Watcher Narrative

I feel that the events of Genesis 6 (especially the Nephilim) is probably best understood against the background of the Watcher Narrative. This can be found in the Book of Enoch, chapters 1 to 36 and you can read it online here.

For some more information on the Enoch literature in general, have a look at the lecture from James C. VanderKam of University of Notre Dame on the St Andrews site.

(image from the Library of Congress)