The Forest House by Marion Zimmer Bradley
My rating: 4 of 5 stars
My first foray into MZB's Avalon series and I intend to read all of them in chronological order.
I enjoyed this a lot and would recommend this to anyone who is interested in Druids, Roman Britain etc.
A lot of other reviewers pointed to the historical inaccuracies in the book, I would say that this is something that simply cannot be prevented in a book of this kind. If you want to read an academically researched book on Druids then I would recommend you pick up Jean Markale. If you want to be entertained, then this is a perfectly good choice.
Other books in the series include: