各種顏色的粉筆們開心的在黑板上著色玩耍，但是接連兩次都有人趁他們離開時破壞了畫作。
到底是誰做的呢? 經由藍蠟筆警官的調查終於抓到了嫌疑犯—「板擦」。
當他們要逮捕犯人時卻被他逃走了。最後，藍色蠟筆會用甚麼方式抓到犯人呢?
但是他們抓到犯人後，「板擦」卻口口聲聲說自己是無辜冤枉的。
I’m not a robber, I’m a duster!
You draw stuff and I rub it out .
我們只是”各司其職”不是嗎?
你認同「板擦」的辯解嗎? 如果你是法官..你會怎麼做呢?
在故事的最後…聰明的警官做出了一個最棒的結合，讓他們可以盡情地一起遊戲、完美結合。
The young chalks are busy at the chalkboard but someone keeps stealing their drawings . . .Mrs Red calls Sergeant Blue to investigate but when the culprit is caught, he absconds in a cloud of chalk dust. The chalks find another way to lure the suspect into their hands and it is only then that they discover they've misjudged the poor chalk rubber all along . . .
With a stunning graphic look on a chalkboard-black background, this is a fun story where readers truly participate in the investigation: looking for the clues, assessing the line-up of suspects, and closing in on the culprit.
