This was a very brief book. It reads almost like a historical record: lots of names (she went with the Roman names for this one) of places, status, etc. In Paxson fashion, she has done a lot of research for the topic. The story is basically the story of the Sword in the Stone: the events leading up to Arthur (Artor) becoming king. The characters don't have depth and the worldbuilding is a minimum, lots of places named, but very little to describe them. She was mainly just getting to the events via the characters. If this were a tv show, it'd be an episode in an anthology about Arthurian legend. Short, to the point, and basically a history lesson about the power vacuume left behind in Britain after the Romans have left. I can see much of the stuff here and how it went to eventually inspire her later Avalon books: Sword of Avalon, Priestess of Avalon and Ravens of Avalon. Also, her close relationship with Marion Zimmer Bradley is very evident. She hints at the magic of Avalon having come from the Atlantic (Atlantis), and the focus is about the pagan religions striving to survive the tide of Christianity.
Overal, 3/5, mostly points just for the history.