What is the main events of The Treasure of Lemon Brown?

In "The Treasure of Lemon Brown," a teenage boy named Greg is warned by his father to stay focused on his schoolwork instead of hanging out in abandoned buildings. Despite this advice, Greg goes to an abandoned house and meets Lemon Brown, a former blues musician. Lemon Brown shares his life story and the meaning of true treasure with Greg, helping him gain a new perspective on life and family. This encounter ultimately teaches Greg about the importance of human connection and the value of wisdom gained through experience.