Gary Grasshopper and his best friend Freddie Firefly are reunited again when Freddie comes to visit during summer vacation. Gary, Freddie, and all their friends are excited about the dance on Friday night. Gary plans to show off the new Disco moves that Olivia Owl has taught him. Join them on this exciting adventure where Gary learns to Disco dance and in the process teaches his friends a valuable lesson about the importance of saying you're sorry. This is the 4th book in the Gary Grasshopper series.