"Neither. If a key is lost it takes a skilful mechanic half-a-day to cut his way in. Then you must remember that clients of a safe-deposit are not multitudinous. All are known more or less by sight to the officials there, and a stranger would receive close attention. Now, Max, by what combination of circumstances is a rogue to know my password, to be able to forge my signature, to possess himself of my key, and to resemble me personally? And, finally, how is he possibly to determine beforehand whether there is anything in my safe to repay so elaborate a plant?" Mr Carlyle concluded in triumph and was so carried away by the strength of his position that he drank off the contents of his second cup before he realized what he was doing. "At the hotel I just spoke of," replied Carrados, "there was an attendant whose one duty in case of alarm was to secure three iron doors. On the night of the fire he had a bad attack of toothache and slipped away for just a quarter of an hour to have the thing out. There was a most up-to-date system of automatic fire alarm; it had been tested only the day before and the electrician, finding some part not absolutely to his satisfaction, had taken it away and not had time to replace it. The night watchman, it turned out, had received leave to present himself a couple of hours later on that particular night, and the hotel fireman, whose duties he took over, had missed being notified. Lastly, there was a big riverside blaze at the same time and all the engines were down at the other end of the city." Mr Carlyle committed himself to a dubious monosyllable. Carrados leaned forward a little. "All these circumstances formed a coincidence of pure chance. Is it not conceivable, Louis, that an even more remarkable series might be brought about by design?" "Our tawny friend?" "Possibly. Only he was not really tawny." Mr Carlyle's easy attitude suddenly stiffened into rigid attention. "He wore a false moustache." "He wore a false moustache!" repeated the amazed gentleman. "And you cannot see! No, really, Max, this is beyond the limit!" "If only you would not trust your dear, blundering old eyes so implicitly you would get nearer that limit yourself," retorted Carrados. "The man carried a five-yard aura of spirit gum, emphasized by a warm, perspiring skin. That inevitably suggested one thing. I looked for further evidence of making-up and found it--these preparations all smell. The hair you described was characteristically that of a wig--worn long to hide the joining and made wavy to minimize the length. All these things are trifles. As yet we have not gone beyond the initial stage of suspicion. I will tell you another trifle. When this man retired to a compartment with his deed-box, he never even opened it. Possibly it contains a brick and a newspaper. He is only watching." "Watching the bookmaker."