The Unfolding Purpose of God, by Stuart Allen.
Mr. Allen brings out the importance of understanding the broad overview of God's purpose in Christ Jesus our Lord (Eph. 3: 11).  Having this enlightenment will help us be approved of God as we live our lives for Him (2 Tim. 2:15).  Mr. Allen has a simple and easy to understand style of writing which makes this book very helpful and enjoyable to the new believer.