Henrietta Mears's all-time classic gives an excellent overview and understanding, in clear and concise language, of every book in the Bible. 
It includes these features: 
 
Reading plans, maps, commentary and other study helps; 
 
Historical background on every key event in the Bible; 
 
How Jesus is revealed in the Old Testament; 
 
Bible teaching suggestions
 
an article on "How to Become a Member of God's Family" 
 
Glossary with clear definitions of Bible words