The book focuses on the topics of Marriage and Descent, which are the foundations of genealogy and an account of the Agikuyu religious system, which was an extremely important part of their culture. It brings on board issues of how Gikuyu and Mumbi culture was, as it guided the clans in the way they lived and how people are linked genetically due common heritage. It shows how clans married to expand, how their behavior was guided by the rich Gikuyu culture including even how they greeted each other.