With yesterday's meatless meatloaf probably responsible for an outbreak of food poisoning at the Woodlands Junior High cafeteria, everyone blames the new science teacher, but the students in Club CSI are convinced that their teacher is innocent.

Club CSI members Hannah, Ben, and Corey combine what they have learned in their forensic science class with investigative skills to find Hannah's missing dog.

A classmate needs Club CSI's help when mysterious charges from a popular internet doodling game appear on her parents' credit card bill.