If you are looking for Merlin's story more generally, these "classics" are frequently cited by reviewers on Reddit and Goodreads :
: This 1996 fantasy novel kicks off a popular series detailing the youth and origin story of Merlin before he became King Arthur's advisor. Book of Merlin
: This is the final, posthumously published volume of the classic Arthurian series The Once and Future King . It serves as a philosophical conclusion where Merlyn reappears to King Arthur before his final battle to discuss ethics, politics, and the causes of war. If you are looking for Merlin's story more