Dog Days is the 4th book of the series, and if you have seen either of the two films none of the plot is in either movie unlike the previous books. While the previous books are a parody on childhood or school, Dog Days is more about summer vacation. Greg Heffley's dog days are filled with laughs and lots of original material. It's a bit better than The Last Straw, but a little worse than the first two books. Still a good read for kids and adults.