In this 17th Diary of a Wimpy Kid book, Greg Heffley decides to join his brother Rodrick’s band, Löded Diper, thinking it’ll be a fun, rock-and-roll adventure. But Greg quickly learns the harsh reality of band life: late-night rehearsals, unpaid gigs, fights between members, and money problems. He has to decide whether helping to make the band “legends” is worth the risk — or if he’ll regret getting involved.