BOOK THREE: A disturbing illness strikes teachers and pupils at Winkton Abbey. They have been paralysed by a poison unknown to science. Lily is a top suspect, but after promising Mr Barnes she would keep her nose out, seeking the truth becomes risky. The crippling illness strikes again and again. Terror overcomes the students. Some girls take the law into their own hands, and if the illness cannot be stopped the school will be closed down, forever.