Blood Behind the Veil

From the book:

Although the book of Hebrews has been greatly ignored by Christian scholars and laymen alike, it contains some of the most important, basic doctrines in the Bible. Spiritual subjects that are scarcely mentioned by other writers have been fully explained by the author of Hebrews.

http://www.amazingfacts.org/media-library/book/e/16/t/blood-behind-the-veil