Christian living/theology/etc books.
I LOVED I Do Again by Jeff and Cheryl Scruggs as a book about God's influence in a marriage, even after it went sour.

Others I've read and enjoyed include:
Celebration of Discipline by Richard Foster.
Do You Think I'm Beautiful? by Angela Thomas.
The Five Love Languages by Gary Chapman.
Creative Prayer by Chris Tiegreen
Spiritually Single Moms by Nancy Sebastian Meyer
God Has A Dream by Desmond Tutu