once. I slipped out the back way, locked the door behind me, put the key in my pocket and started off, chuckling to myself and comfortable.

Well, I had gone and spoiled it again, made another mistake. A double one, in fact. There were plenty of ways to get rid of that officer by some simple and plausible device, but no, I must pick out a picturesque one; it is the crying defect of my character. And then, I had ordered my procedure upon what the officer, being human, would naturally do; whereas when you are least expecting it, a man will now and then go and do the very thing which it’s not natural for him to do.

The natural thing for the officer to do, in this case, was to follow straight on my heels; he would find a stout oaken door, securely locked, between him and me; before he