I was so pleased to find a series of books about the mysterious Guenevere that I bought all three at once. What a waste of money. I got to page 300 and something in the first one, and then realised I had lost the will to live and gave up. These books are so disappointing. They could be, should be, a really interesting tale about a mysterious and magical time, instead G herself is completely wet, Arthur is frankly childish, Merlin laughable and revolting. Miles is meant to be a historian (according to the blurb) but she has so many anachronisms that it got really hard not to throw the book across the room in fury (Your majesty, four poster beds, table linen to name a few). Add to that Arthur meeting Guenevere at Beltane (early May), hanging around for a week and then marrying her at Midsummer (end June)and you can see why I withered.
If you want a trilogy about Arthurian times, steeped in the magic and mists of the time, read Mary Stewart's Merlin books. I'm off to take these three to Oxfam.