"Let's get on the barge," said Don Luis. "I've left some important papers there." Patrice followed him. Opposite the cabin containing Grégoire's body was another cabin, reached by the same companion-way. It was furnished with a table and a chair. "Here, captain," said Don Luis, taking a letter from the drawer of the table and settling it, "is a letter which I will ask you to . . . but don't let us waste words. I shall hardly have time to satisfy your curiosity. Our friends are coming nearer. Well, we were saying, the golden triangle . . ." He listened to what was happening outside with an attention whose real meaning Patrice was soon to understand. And, continuing to give ear, he resumed: "The golden triangle? There are problems which we solve more or less by accident, without trying. We are guided to a right solution by external events, among which we choose unconsciously, feeling our way in the dark, examining this one, thrusting aside that one and suddenly beholding the object aimed at. . . . Well, this morning, after taking you to the tombs and burying you under the stone, Essarès Bey came back to me. Believing me to be locked into the studio, he had the pretty thought to turn on the gas-meter and then went off to the quay above Berthou's Wharf. Here he hesitated; and his hesitation provided me with a precious clue. He was certainly then thinking of releasing Coralie. People passed and he went away. Knowing where he was going, I returned to your assistance, told your friends at Essarès' house and asked them to look after you. Then I came back here. Indeed, the whole course of events obliged me to come back. It was unlikely that the bags of gold were inside the conduit; and, as the _Belle Hélène_ had not taken them off, they must be beyond the garden, outside the conduit and therefore somewhere near here. I explored the barge we are now on, not so much with the object of looking for the bags as with the hope of finding some unexpected piece of information and also, I confess, the four millions in Grégoire's possession. Well, when I start exploring a place where I fail to find what I want, I always remember that capital story of Edgar Allan Poe's, _The Purloined Letter_. Do you recollect? The stolen diplomatic document which was known to be hidden in a certain room. The police investigate every nook and corner of the room and take up all the boards of the floor, without results. But Dupin arrives and almost immediately goes to a card-rack dangling from a little brass knob on the wall and containing a solitary soiled and crumpled letter. This is the document of which he was in search. Well, I instinctively adopted the same process. I looked where no one would dream of looking, in places which do not constitute a hiding-place because it would really be too easy to discover. This gave me the idea of turning the pages of four old directories standing in a row on that shelf. The four millions were there. And I knew all that I wanted to know."