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.