They paid off the taxi before the house, and Leon sprinted to the garage to get the car. The man who opened the door to them was he who had been tied up by the pedlar at Heavytree Farm, and his first words came as a shock to Manfred: “Digby’s here, sir.” “Digby?” said the other in surprise. “I thought he was on duty?” “He’s been here since just after you left, sir. If I’d known where you had gone, I’d have sent him to you.” Digby came out of the waiting-room at that moment, ready to apologize. “I had to see you, sir, and I’m sorry I’m away from my post.” “You may not be missing much,” said Manfred unsmilingly. “Come upstairs and tell me all about it.” Digby’s story was a strange one. He had gone down that afternoon to the canal bank to make a reconnaissance of ground which was new to him. “I’m glad I did too, because the walls have got broken glass on top. I went up into the Old Kent Road and bought a garden hoe, and prised the mortar loose, so that if I wanted, I could get over. And then I climbed round the water-gate and had a look at that barge of his. There was nobody about, though I think they spotted me afterwards. It is a fairly big barge, and, of course, in a terrible state, but the hold is full of cargo—you know that, sir?” “You mean there is something in the barge?” Digby nodded. “Yes, it has a load of some kind. The after part, where the bargee’s sleeping quarters are, is full of rats and water, but the fore part of the vessel is water-tight, and it holds something heavy too. That is why the barge is down by its head in the mud. I was in the Thames police and I know a lot about river craft.” “Is that what you came to tell me?” “No, sir, it was something queerer than that. After I’d given the barge a look over and tried to pull up some of the boards—which I didn’t manage to do—I went along and had a look at the factory. It’s not so easy to get in, because the entrance faces the house, but to get to it you have to go half round the building, and that gives you a certain amount of cover. There was nothing I could see in the factory itself. It was in a terrible mess, full of old iron and burnt-out boxes. I was coming round the back of the building,” he went on impressively, “when I smelt a peculiar scent.” “A perfume?” “Yes, sir, it was perfume, but stronger—more like incense. I thought at first it might be an old bale of stuff that had been thrown out, or else I was deceiving myself. I began poking about in the rubbish heaps—but _they_ didn’t smell of scent! Then I went back into the building again, but there was no smell at all. It was very strong when I returned to the back of the factory, and then I saw a little waft of smoke come out of a ventilator close to the ground. My first idea was that the place was on fire, but when I knelt down, it was this scent.” “Joss-sticks?” said Poiccart quickly.