Gregs dad is geting on him because of his bad grade in math and tells him he can't play basketball for the scorpion's
Greg is thinking about the punishment his dad is going to give him because his bad grades and his dad wont let him play basketball with bad grades.
Greg is running away because his dad is pushing him to get better grades.
Greg ran to an abandon house and met an homeless old man, they start talking and the old man explains things about his treasure and three robbers overheard what Lemon was saying.
The robbers come in the abandon house to search for the treasure and Lemon and Greg work together to stop the three thugs.
After the three thugs ran away and Greg asked about his treasure and Lemon tells him that he had a harrmonica years ago and gave it to his son when he went to war he ended he died and his son cherished it and Lemon cherishes it now with Lemons old newspapers from his shows years ago then Greg realized how important family is.