Quick, what is the Bible about?

How do you boil down the Scriptures? In seeking to grow in my understanding....AND...
In thinking through how to help people get a grasp on the whole of the Bible, I came across a lecture that I'm about half-way finished with. It is almost 4 hours. Yes, 4. But if you took an hour a month to listen, you'd finish in 4 months. How does that compare what you've done in the last four months to grasp the message of the Bible? The lecture is by David Jackman (no relation to Hugh--i don't think), who is a UK friend of Tim Keller's. He's a good teacher and the accent is always cool. Link is here