Stephen R. Lawhead
This is the fifth and final book in Lawhead’s “Pendragon Cycle”. It takes place in a modern Britain that’s on the verge of getting rid of royalty and becoming a republic. Merlin is still alive and has identified a young Scotsman as the next rightful king of England and as the not-quite-reincarnation of Arthur himself. It’s a mix of political thriller and Arthurian tale, entertaining if you don’t look too closely.