Worshiping with Angels and Archangels

For Christmas we gave our 10 year old son a book that explains the historical liturgical style of worship in a Lutheran church. The book is Worshiping with Angels and Archangels An Introduction to the Divine Service. I thought it would be educational for him, but was surprised and STUNNED at what I didn't know. In all my years as a Lutheran so much was not explained. This book is awesome.