Whenever Christian Audio offer a free audio-book of some significant substance we let you know!
This one is simply awesome (apologies for using that word!). Great book by a great author:
For this month only (February 2015) you can access it for free here.
"This book is anything but a dry discussion of minute points of doctrine. Dr. Sproul, demonstrating his trademark ability to make complex subjects easy to understand, surveys the basic truths of the Christian faith, reminding us once more of what God is like and of what He has done for His people in this world and the next." Ligonier Ministries
Please read on for a video understanding of the book...