I mounted painfully enough as high as the chimney pots, not without some damage to the skin of my hands and knees, and a good deal of slipping and sliding. A game of hide-and-seek followed. Reaching the opposite slope of the roofs, which concealed me and put me farthest away from the enemy, I crept as swiftly as I could from chimney-stack to chimney-stack with ever a keen eye for a means of getting down again into the street. Some yards ahead I saw that the straight line of the tiles was broken by a dormer window. I made to this for here was the very chance that I desired. Alas! when I reached it I found it secured from within. I had no time in which to break a pane of glass in the hope that I might put my hand through and discover the fastenings. A couple of the traps had already found out in which direction I had gone, and were even now standing on the apex, and beckoning to the others. I moved away to another dormer window a few yards further on. It too was fast, but looking ahead I saw, greatly to my relief, that a third was standing open. My satisfaction had a short life, however. For scarcely had I made two yards towards it ere I observed a thing that in my haste I had overlooked. The line of the houses ended abruptly; the open window belonged to another row. Between ran an alley or a narrow street, wide enough to make me pause in my career. Hard pressed as I was, I must confess that I had no fancy to attempt a leap so precarious. I turned to go back, but the enemy had followed so smartly on my heels that I saw in a glance that there was no chance of retreating by the way I had come. My only hope lay in a forward direction; I could not possibly retire. Nor must I hesitate an instant either. The closer I came to this gulf in the houses the more desperate it looked, but my resolve was already taken. A drowning man clutches at a straw.