The porter said something in Arabic to the driver, and a moment later we were off in pursuit. It was a beautiful night, and, after the heat of the day, the rush through the cool air was infinitely refreshing. It was not until we had gone upward of a mile, and the first excitement of the chase had a little abated, that the folly of what I was doing came home to me, but even then it did not induce me to turn back. Connected with Pharos as I was, I was determined if possible to find out something more about him and his doings before I permitted him to get a firmer hold upon me. If I could only discover his business on this particular night, it struck me, I might know how to deal with him. I accordingly pocketed my scruples, and slipping my hand into my pocket to make sure that my revolver was there, I permitted my driver to proceed upon his way unhindered. By this time we had passed the Kasr-en-Nil barracks, and were rattling over the great Nile bridge. It was plain from this that whatever the errand might be that was taking him abroad, it at least had no connection with old Cairo. Crossing the Island of Bulak, and leaving the caravan depot on our left, we headed away under the avenue of beautiful Lebbek-trees along the road to Gizeh. At first I thought it must be the Museum he was aiming for, but this idea was dispelled when we passed the great gates and turned sharp to the right hand. Holding my watch to the carriage-lamp, I discovered that it wanted only a few minutes to eleven o'clock.