The Once and Future King by TH White.
Not serious enough for me. But has a lot of detail. Third person. Merlin and "Wart", whom I guess is to become King Arthur. 100 pages in. Feels very random. Now having an adventure with Robin Hood. Merlin turns "the Wart" into animals a lot. If it were to suddenly get more serious it could be good. Here and there it is a little serious. But I can hardly be bothered to read this.