Someone at the prestigious Danforth Academy is trying to make the students sick! Who could be behind such a terrible trick? Is it Mia and Riley, the rich girls? Or could it be Emily, the Principal's daughter? Maybe it's the wacky Sean Niminsky, or even the eccentric Professor Plume. Whoever it is, Abby, Paige, Claire and Taylor will have to put aside their differences and band together to solve the mystery!