The Story starts with Greg and his dad. They're both in their house on a dark and rainy day.
Greg asks his dad if he can play basketball (join a team), but his dad said no because his grades in school (mentions mostly math) are low and bad, and he tells Greg to go study, but instead he goes to an abandon building (it seems like), and hangs out in there.
Can I join a basketball team?
No! Do math because your grades are bad!
But then, an old man comes in the room Greg is in. He goes by the name of Lemon Brown, and Lemon Brown tells Greg he has "treasure" on him.
Hi, I'm Lemon Brown and I have treasure!
But then three men came in the building and started beating up Lemon Brown because they wanted his treasure. They thought he had something like gold, money, or something really rare that they could sell, but it wasn't, plus they didn't find Lemon Brown's treasure.
After that, Greg comes out of his hiding spot to Check if Lemon Brown was okay. Lemon Brown had a few bruises, but he was fine. Then he showed Greg his treasure, which was an old harmonica, and old pictures of Lemon Brown performing with the harmonica.
Are you okay?!?
Yeah, here's my old harmonica, and old pictures of me performing with it.
So then Greg leaves the building to go home, promising Lemon Brown that he'll look out for his treasure/take good care of it. This day/Today, Greg got along with other people, and learned to look out for other's and himself.