It's Hiccup's birthday, but that's not going to keep him from getting into trouble. To save his dragon, Toothless, from being banished, Hiccup must sneak into the Meathead Public Library and steal the Viking's most sacred book. But the Vikings see books as a dangerous influence, and keep them locked up and under heavy guard. To save his friend, Hiccup must brave the Hairy Scary Librarian and his dreadful army of Meathead Warriors and face off against the formidable Driller-Dragons. Will he make it out and live to see his next birthday?
看似美好的生日上，小嗝嗝依然惹禍上身。為了救他的龍無牙不被流放，小嗝嗝必須溜進笨蛋公共圖書館並偷走維京人最神聖的一部書。視書為危險品的維京人，將書都鎖了起來並重兵嚴防。為了拯救他的朋友，小嗝嗝必須勇敢面對圖書館與令人生畏的 笨蛋戰士，還要對抗鑽洞龍。小嗝嗝可否成功並活著度過他下一次的生日？