Greg Heffley's family are going to have to count their pennies this summer. That means, no beach holiday and lots of 'family togetherness'. Which doesn't sound like a whole lot of fun. The only good thing Greg has to look forward to is his birthday, but even THAT ends in a disaster. And when his dad brings home a brand-new addition to the family, Greg is outnumbered. It could be a real dog of a summer.