Numbuh 2 has set up a private eye office in the school janitor closet, and soon he gets his first case – someone is inflicting students with bad cases of pink-eye! When Numbuh 86 becomes the latest victim and he gets no help from Joe the hall monitor (his old partner before he joined the KND), 2 does some of his own deductive work – until Joe attacks him. When he confronts the crooked monitor, Joe himself is attacked, and 2’s investigations lead him to the school nurse – who appears to be using the students’ illness to make the topping for crumb cake! Can Numbuh 2 close the case on this crummy cake caper?!