A Christian's Pocket Guide to Being Made Right With God: Understanding Justification by Guy Waters and published by Christian Focus Publications.
Justification is not a relic of the past - it has direct relevance to us as Christians today. We often struggle with the thought of justification because of human pride; "I can't be that bad" and so justification is often undermined, wrongly presented or just plain ignored. Scripture though, is brutally clear: we have a real problem - the prospect of our lives marred by wrong-doing being laid out before an almighty God who is pure and will not forever let wrong go unpunished.
We can't earn our way out of our predicament - as this is just "rubbish" according to the apostle Paul. We need something else, someone who can take the hit we so richly deserve - leaving us to be declared innocent instead.