When Ike and his little sister Mem spend the weekend at their grandparents' farm, they resent all the work they must do, until they realize that there is more to their visit than just doing chores.
While trying to build a tree house for guys, Ike and his best friend Buzzy argue so much that Ike builds his sister Mem a play house instead, but still misses his friend.
Ike feels bad about not saying anything to neighborhood bully Dave when Dave insists on killing lightning bugs to separate their glowing parts from their bodies to make "lightning rings" for the other children's fingers.