I determined to listen.

I went up-stairs to my room, which, you know, is close to Miss Gray's and Gertrude's.

If you had known girls as long as I, you would know that they usually make friends and confidantes of each other.
I found this to be true in the present case.

Gertrude had not been in their room above five minutes before Miss Gray came to the door and asked to come in.

It was immediately opened, and she entered." "And what then ?" "I listened." "Just so; I expected that.