The first book of the Bible, Genesis, shows that rebellion against God's good provisions resulted in humanity being deceived and sinning against God. The rest of the Bible books show that we are all sinners, yet that God's plan to deliver us from our sin is being worked out, supremely in the person of Jesus Christ. The last book of the Bible, Revelation, shows the final outcome for rebels who won't repent, and sinners who have repented. So you could say that the Bible is about the triumph of God's love, justice and mercy over sin, so that God is justified and glorified, as seen most clearly in what Jesus did when He left God's side in heaven to become the man who died on the cross to take away the sin of the world.
Basic Instructions Before Leaving Earth = BIBLE