Carrados smiled and nodded and resumed his former expression, which was merely that of an uninterested gentleman waiting patiently for another. It is something of an attainment to watch closely without betraying undue curiosity, but others of the senses--hearing and smelling, for instance--can be keenly engaged while the observer possibly has the appearance of falling asleep. "Now," announced Mr Carlyle, returning briskly to his friend's chair, and drawing on his grey suede gloves. "You are in no particular hurry?" "No," admitted the professional man, with the slowness of mild surprise. "Not at all. What do you propose?" "It is very pleasant here," replied Carrados tranquilly. "Very cool and restful with this armoured steel between us and the dust and scurry of the hot July afternoon above. I propose remaining here for a few minutes longer." "Certainly," agreed Mr Carlyle, taking the nearest chair and eyeing Carrados as though he had a shrewd suspicion of something more than met the ear. "I believe some very interesting people rent safes here. We may encounter a bishop, or a winning jockey, or even a musical comedy actress. Unfortunately it seems to be rather a slack time." "Two men came down while you were in your cubicle," remarked Carrados casually. "The first took the lift. I imagine that he was a middle-aged, rather portly man. He carried a stick, wore a silk hat, and used spectacles for close sight. The other came by the stairway. I infer that he arrived at the top immediately after the lift had gone. He ran down the steps, so that the two were admitted at the same time, but the second man, though the more active of the pair, hung back for a moment in the passage and the portly one was the first to go to his safe." Mr Carlyle's knowing look expressed: "Go on, my friend; you are coming to something." But he merely contributed an encouraging "Yes?" "When you emerged just now our second man quietly opened the door of his pen a fraction. Doubtless he looked out. Then he closed it as quietly again. You were not his man, Louis." "I am grateful," said Mr Carlyle expressively. "What next, Louis?" "That is all; they are still closeted." Both were silent for a moment. Mr Carlyle's feeling was one of unconfessed perplexity. So far the incident was utterly trivial in his eyes; but he knew that the trifles which appeared significant to Max had a way of standing out like signposts when the time came to look back over an episode. Carrados's sightless faculties seemed indeed to keep him just a move ahead as the game progressed. "Is there really anything in it, Max?" he asked at length. "Who can say?" replied Carrados. "At least we may wait to see them go. Those tin deed-boxes now. There is one to each safe, I think?" "Yes, so I imagine. The practice is to carry the box to your private lair and there unlock it and do your business. Then you lock it up again and take it back to your safe."