Other Books
Sometimes, a book doesn't fit in any of the series, yet is still an integral part of Shelly's World. Those books are sold as stand-alone novels, but be aware that the characters could pop up again, anytime, in any of the other novels in any series.
Tumbleweed and The Rats of Argon explore the darker sides of life. They show that God can work any place at any time, even in dire circumstances. Although sometimes it may seem like He has forsaken us, He never will. We only need to trust in Him and His Will.
As distasteful as it is to Christians, divorce does happen. Even then, God won't forsake us. Runaway takes that into account as it follows Travis and Tamlyn, trying to live a Christian life through all the trials and tribulations of real life.