Meet Katie Milk - she's brave, funny, has an active imagination and is about to go off to boarding school for the first time. At first she can't imagine having a worse roommate than Bernadette Kelly but soon Katie has more important things to worry about . . . Are there really mad nuns in the attic and why does Chiquita Morris cry all the time? Is Chiquita's mother really a famous fashion model, as she claims or is she just trying to get attention? When Katie and Bernadette discover some mysterious goings-on in an old farmhouse near their school, Katie is one step closer to finding the answers . . .