Tá sé ina shamhradh agus tá na páistí ar fad taobh amuigh ag spraoi. Ach cá bhfuil Greg Heffley? Istigh sa teach atá sé, ag imirt físchluichí agus na cuirtíní dúnta aige. Seo an cineál saoire is ansa le Greg. Ach ní mó ná sásta atá Mama leis. Tá liosta fada imeachtaí leagtha amach aici siúd dó, chomh maith le neart eachtraí teaghlaigh, amuigh faoin aer. Cé aige a mbeidh an bua - Mama nó leadaí na leisce?
The way I like to spend my summer holidays is in front of the TV, playing video games with the curtains closed and the light turned off. Unfortunately, Mom's idea of the perfect summer holiday is different from mine. Greg's mom has a vision of family togetherness that really doesn't sound a whole lot of fun. But there's a brand-new addition to the Heffley family to contend with and it looks like Greg might be outnumbered. It could be a real dog of a summer...