Un fantasma en el jardín

Justina and her friends are now in their third year of school. A new girl named Letitia has joined the Barnowls. She does not like to follow the rules, and, for some strange reason, the teachers don't seem to mind. The day after a big party, the girls see a ghost in the garden; then one of them disappears! Soon strange ransom notes appear. Will Justina find out who is responsible before it's too late?