This book is the latest book of the `Diary of a wimpy kid` series.This book is written by Jeff kinney.In this book, the main character is Greg heffley.This book says the story of Greg`s grandmother`s birthday and the way Greg`s family had to suffer through the whole incident.It all started when Greg`s grandmother said to her daughters that she cannot do any actual celebration on her birthday as her health is not in the best situation.She said that the whole family had to go to the Ruttyneck Island and take a family photo for her while she rest in her room.For the family photo, the whole family went to Ruttyneck Island and there, the whole situation got worse.Food, clothes, and other things were hard to get, and at the final they actually did not get the photo their grandma actually meant.But the twist is, they returned to grandma a day early ,that is in the day grandma`s birthday was, and the scene there was actually kind of embarrassing.Grandma invited her friend for the birthday party while the family members was suffering to get a photo at the Ruttyneck Island.But, at the end, Greg found the recipe of his grandma`s famous meatballs that made her the head of the family.This means that, Greg might be the next head of his family later on!