This is the Twenty-ninth in my one-book-at-a-time bookshelf.
It is always difficult to conclude a series (or a book for that matter). I think Susan Cooper hits the mark with this last book in the sequence. The familiar characters have their work cut out for them and there are twists and satisfying resolutions.
The Dark is Rising sequence is still in print after nearly fifty years so I think I'm not alone in my enjoyment.