"See the consul general. I've talked with him. He will give you a rubber boat and a Nansen bottle I've picked up. Outfit for the trail, and have plenty of weapons. Fly to Chungking and check in with the consul there. Ask him to give you a reliable guide. You're going to Korse Lenken. That's in Tibet." He spelled the name. "Chahda has gone on ahead. I'll follow. That's where the heavy water is coming from, I'm pretty sure. Chahda will check up. You can help him, then make tests to be sure it's really heavy water. Maybe you can do something about the source of the stuff. You'll have to see when you get there. I've got part of the story about what's being done with the water, but not all of it." There definitely were voices outside now. The burp gun had brought the hotel people. In a moment there was a hammering on the door. Bradley walked to the window. "You can let them in after I've gone. Any questions? Quickly!" "What's the Nansen bottle for?" Zircon demanded. "I don't know. I only know that Long Shadow bought five of them." Bradley threw a leg over the window sill and grinned at them. "Leave me out of any story you tell. I need a free hand for the next few days. And the less the police know about me the better for all of us." He hesitated as the pounding on the door grew louder, then a key grated in the lock. "I can tell you this," he said softly. "You can forget about an industrial plant. This is something else we're up against." Then he was gone. "Open the door," Zircon said. For the first time, Rick saw that the big scientist gripped his right arm just below the elbow, a red, sodden handkerchief balled in his left hand. "You're wounded!" He jumped to the scientist's side. "A scratch," Zircon said. "But it saved our lives. Tell you about it later. Open up, Scotty." Scotty threw the door open and the English night clerk, three Chinese policemen, and half a dozen coolies piled in. "What's going on here?" the clerk demanded. "What happened?" "Nothing serious," Zircon said calmly. "There was evidently a bandit in our room. We opened the door and he fired with his submachine gun. Then, when he saw he hadn't killed us, he fled." It wasn't a very convincing story. Rick saw suspicion in the faces of the hotel people. He threw in his nickel's worth. "What kept you so long? We've been trying to phone." He had a hunch the switchboard coolie was one of those in the room. Probably everyone on duty had raced up. "We heard nothing downstairs," the night clerk said. "The floor coolie came down to get us. He took his time about it. Why was your door locked?" Zircon tried hard to look sheepish. "I guess we must have bolted it in the confusion. Then, when you knocked, we tried to open it. It was a few seconds before we realized the bolt had been thrown and the door couldn't be opened unless the bolt was withdrawn. And the confounded thing stuck." "Why didn't you yell?" one of the policemen demanded.