What is the lost years of Merlin about?

"The Lost Years of Merlin" is a fantasy novel by T.A. Barron that explores the early life of the legendary wizard Merlin before he becomes the iconic figure in Arthurian legend. The story follows a young boy named Emrys, who discovers his magical abilities while facing personal challenges and a mysterious destiny. As he embarks on a quest to uncover his true identity and purpose, Emrys encounters mythical creatures, powerful adversaries, and the struggle between good and evil. The novel delves into themes of self-discovery, friendship, and the importance of choices in shaping one's future.