This is a simple, old-fashioned allegory about our relationship with Jesus and our journey to heaven (the "King" and the "Golden City"). The story is about a girl named Dilecta who struggles in the "Land of Exile" to keep her "hut" in order in order to be prepared for the King's visits, keep her "lamp" of peace burning brightly and control "Self", and listen to her "Prince Guardian" who helps to keep her out of the snatches of Malignus.
My daughter (2nd grader) enjoyed listening to the story and figuring out what each part of the story was trying to say in "real life". Sometimes children enjoy this sort of challenge of uncovering ideas that are somewhat hidden - working at the ideas can help to make them more meaningful.
This book covers a great deal of material in a simple manner - children are introduced to basic components of the spiritual life and encouraged to develop a strong relationship with our Lord through the Sacraments and a detachment from the things of this world.
This would make a nice religion supplement for young homeschooled children, but may be less appealing to those who have already been more exposed to today's culture.
Update: Over the years we have returned to this lovely book again and again (especially when we have a child preparing for First Communion) - and were delighted to be introduced to this new full-color edition with lovely old-fashioned illustrations and beautiful, glossy pages.