This is a book supposedly written by Enoch that some say was left out of the Bible canon by the early church when it was being put together.
I'm in the middle of it and find it very interesting.
It gets into some fascinating details about the pre-flood world than the books in the regular Bible canon. Enoch has a lot of visions which are very reminscent of Revelation.
I have mixed feelings about this book. Although it reads very 'Bibley' (is that a word? ), I'm not sure how authentically I should regard it.
If nothing else, it's very entertaining.