Filch found them trying to force their way through a door that unluckily turned out to be the entrance to the out-of-bounds corridor on the third floor.
I did not fear her breaking bounds; because the gates were generally locked, and I thought she would scarcely venture forth alone, if they had stood wide open. Unluckily, my confidence proved misplaced.
Since M. Duval did not return to see me, I decided to go and see him. A pretext was not difficult to find; unluckily I did not know his address, and no one among those whom I questioned could give it to me.