內容簡介:
噗噗！幫乘客找回快樂的火車之旅～
難得的休假，屁屁偵探和小狗布朗打算來趟悠閒的火車之旅。他們搭上了「白鴿鐵道」的列車，沒想到車廂內卻發生了火車便當接二連三消失的神祕事件，列車長「咕咕山」不想壞了乘客們的遊興，因此求助於屁屁偵探。屁屁偵探從不同種類的便當中找到了一項共通點，就是列車上最有名的起士漢堡。
火車不停往前奔馳，屁屁偵探則循著線索，在一節又一節的車廂中搜索嫌疑犯。他能找到那個到處在起士漢堡上留下齒痕的傢伙，讓大家享受快樂的旅程嗎？
而遠離城市的屁屁偵探，又究竟想去哪裡消磨他的度假時光呢？
Butt Detective is a fun mystery series for 3+ years old
On a rare vacation, Butt Detective and his puppy decides to take the train. They boarded the "White Pigeon Railway" train and found themselves in the middle of a mystery - all the bento boxes were disappearing, one after another.
Help Butt Detective find clues and search the different suspects. Who is the one leaving teeth marks everywhere? Come help solve the mystery with Butt Detective!
After the mystery is solved, don't forget to look at all the other puzzles and hidden stories on the dust jacket. You'll be invited to read and reread the book to discover more mysteries in these pages.