Greg Heffley has always been eager to grow up, but is the journey to adulthood truly what children envision? Suddenly, Greg finds himself navigating the complexities of mixed-gender parties, an escalating array of responsibilities, and a host of other unwelcome changes that come with maturity—all without the support of his best friend, Rowley. Can Greg navigate this challenging landscape on his own? Will he be forced to confront the harsh realities of growing up?