The School Masters Tower holds the Storian. Wherever the Storian goes the tower follows.
During The School for Good and Evil the Tower lies between the School for Good 's lake and the School for Evil 's moat. However, Tedros steals the Storian and takes it with him to the School for Boys, causing the Tower to move to the School for boys as well.
The Tower aslo holds the original books all the fairytales that have been written.