For the hotel had itself been the scene of the Algiers Mystery, and the Algiers Mystery was at once the simplest, the most charming, and the most perplexing mystery in the world. One morning, the first of April in the previous year, an honest John Bull of a guest had come down to the hotel-office, and laying a five-pound note before the head clerk, had exclaimed: “I found that lying on my dressing-table. It isn’t mine. It looks good enough, but I expect it’s someone’s joke.” Seven other people that day confessed that they had found five-pound notes in their rooms, or pieces of paper that resembled five-pound notes. They compared these notes, and then the eight went off in a body down to an agency in the Boulevard de la République, and without the least demur the notes were changed for gold. On the second of April, twelve more people found five-pound notes in their rooms, now prominent on the bed, now secreted--as, for instance, under a candlestick. Cecil himself had been a recipient. Watches were set, but with no result whatever. In a week nearly seven hundred pounds had been distributed amongst the guests by the generous, invisible ghosts. It was magnificent, and it was very soon in every newspaper in England and America. Some of the guests did not “care” for it; thought it “queer,” and “uncanny,” and not “nice,” and these left. But the majority cared for it very much indeed, and remained till the utmost limit of the season. The rainfall of notes had not recommenced so far, in the present season. Nevertheless, the hotel had been thoroughly well patronised from November onwards, and there was scarcely a guest but who went to sleep at night hoping to descry a fiver in the morning. “Advertisement!” said some perspicacious individuals. Of course, the explanation was an obvious one. But the manager had indignantly and honestly denied all knowledge of the business, and, moreover, not a single guest had caught a single note in the act of settling down. Further, the hotel changed hands and that manager left. The mystery, therefore, remained, a delightful topic always at hand for discussion. After having chatted, Cecil Thorold and Mrs. Macalister danced--two dances. And the hotel began audibly to wonder that Cecil could be such a fool. When, at midnight, he retired to bed, many mothers of daughters and daughters of mothers were justifiably angry, and consoled themselves by saying that he had disappeared in order to hide the shame which must have suddenly overtaken him. As for Mrs. Macalister, she was radiant.