Marion Zimmer Bradley is one of the best and "The Forest House" does not disappoint. Rich in well researched history, legend, and myth, the book takes us on a fascinating journey through the Roman and Celtic world of the 1st century CE. I read this book and it's companions, "Lady of Avalon," and "Mists of Avalon" years ago. Enjoyed them so much that they called to me to read them again. I am so glad I did! If you enjoy this genre, do yourself a favor and read this series. Although Bradley wrote the "Mists of Avalon" first, I would recommend reading the prequels in order, first: "Forest House" then "Lady of Avalon."
Mists was FABULOUS. Forest House good. It flowed right along, there were characters to care about but, at some points I wanted them to be making different choices. I did feel the end felt abrupt and too many threads hanging. I look forward to reading others in the series.