It’s summer vacation, the weather’s great, and all the kids are having fun outside. So where’s Greg Heffley? Inside his house, playing video games with the shades drawn.
Greg, a self-confessed “indoor person,” is living out his ultimate summer fantasy: no responsibilities and no rules. But Greg’s mom has a different vision for an ideal summer . . . one packed with outdoor activities and “family togetherness.”
Whose vision will win out? Or will a new addition to the Heffley family change everything?
誰說放暑假一定要天天出去玩？我就是喜歡待在家裡啊……
終於放暑假了！天氣晴朗的夏日午後，大家都在戶外瘋狂玩耍、撒野，盡情享受溫暖的陽光。歡樂的人群中卻少了一個人影，葛瑞到哪裡去了？原來他宅在家裡打電玩，關窗拉窗簾，不讓陽光照進來……
他向老媽坦承自己是一個比較「室內型」的人，並且矢志完成終極夢想──度過三個月打電玩、每天睡到自然醒的生活。但老媽才不讓懶散的葛瑞得逞！她總是催促葛瑞出門找朋友、鼓勵他多和家人進行「情感交流」，並且安排了一連串的家庭活動。
然而，老媽的計畫卻接連發生意想不到的插曲……母子倆鬥法的結果，會是老媽的一番苦心獲得兒子的感謝，還是葛瑞終於實現他最初的夏日夢想？
——中文簡介摘自未來出版出版《葛瑞的囧日記 4：辛酸的夏天》