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...