Greg Heffley has always been in a hurry to grow up. But is getting older really all it's cracked up to be? Suddenly Greg is dealing with the pressures of boy-girl parties, increased responsibilities, and even the awkward changes that come with getting older. And after a fight with his best friend Rowley, it looks like Greg is going to have to face the "ugly truth" all by himself...
Unfortunately, he’s also got an older brother, Rodrick, who has a talent for sniffing these things out. But secrets can’t stay under wraps for long—especially when there’s a diary involved. Rodrick’s band, Löded Diper, has never been so awful, and the laughs have never been so loud.