I would recommend this book to any girl between the ages of 11-21. It had such an amazing impact on my life and relationship with God. There are 12 books total in the series. It follows the life of Christy Miller and her friends from the age of 14-18. The first few books touch on some stronger teen problems, but as they go along it's becomes more about learning to follow what God's plans are for your life. The books are now combined into 4 volumes. There is also 3 more Christy Miller books called Christy and Todd: The College Years. They are must reads as well.