I think I must have been the last person to find out--I was almost to Charms when Professor Acton came out and told all of us in the corridor to go back to the Tower, and she actually walked back with us!

I wanted to ask her what it was all about but she looked so stern and Professor Acton hardly ever looks stern!

It's giving me the Shudders to think that a killer was roaming the school while we were on our way to lessons.