The High House is the first in the Evenmere Trilogy and is now back in print.
The High House is a mysterious house in a remote location in Britain. The house is large but magically contains multiple countries. As Enoch (yes, that Enoch from Genesis) explains at the end of the book that the house is a kind of parable for the universe. The master of the house is the key to maintaining the necessary balance between the countries within the house and the natural and supernatural forces of the universe.
This story centers on half brothers and the struggle with evil and chaos that they are caught up in. The one brother was sent away for his protection when he was young. The other brother remains. The father of the boys, and master of the house, disappears for ten years. After ten years, the elder son is brought home so that the will may be read. He is to be master, if the house chooses him.
He is walking into a time of epic struggle. The anarchists have gained the master keys and have learned to use them to wreak destruction upon the countries and peoples in the house. They are bent on a destruction that is evil. The brothers join forces in order to find their father and defeat the anarchists.
In the process of fighting the anarchists, the brothers demonstrate heroic and sacrificial courage and learn their own place within the house.
I found the story gripping. The struggle between good and evil is masterfully told. If you enjoy fantasy, you will enjoy The High House.