But Isabel looked too frightened to take the matter lightly.

“Don’t speak so loud, Regina,” she said in a half whisper; “some one may be near us, inside.”

She was quite pale with excitement, yet, timid though she was, her curiosity, as well as mine, was thoroughly awakened.

“We may as well glance in,” she went on, “if we are very, very careful. Just give a look round, Regina,” and she drew back to allow me to do so.

I obeyed her cautiously. All seemed safe; there was no one in view or within hearing.

“It is all right,” I said, withdrawing my head; “we may go in a few steps, I am sure, without danger.”

“Well, first draw-to the door a little,” said Isabel sensibly, “for fear of any passer-by noticing that it is open.”

When we found ourselves fairly within the grounds, we looked at each other before we looked at anything else. I could not repress a half-nervous laugh.

“Don’t you feel like a detective or a conspirator?” I said.

Isabel grew still more frightened.