The Last Enchantment (Merlin Trilogy, 3rd book) by Lady Mary Stewart (Book 1 -The Crystal Cave, Book 2 -The Hollow Hills) Recommended by many as the most engaging books ever written in the genre of Aurthurian Lore. 5 stars
Mary Stewart - A favorite of mine for over 40 years. Author of The Moonspinners, Airs Above the Ground, The Crystal Cave etc... Romantic suspense and Arthurian history. "Mary Stewart is Magic" said The New York Times and I agree.