Serious Graffiti

Damian Drooth is electrified to hear the Headmaster tell everyone off about graffiti in one of the school toilets. He immediately wants to bring all his powers of detection to bear to find the perpetrator - with his class of willing detective apprentices. What with sorting out a handwriting test, and looking for matching paint, he needs all the help he can get! But even Damian isn't expecting to be accused of the crime himself! Can this phenomenally lucky and outrageously successful investigator extricate himself, and still catch the criminal? Of course he can!