It was a Chinese pigtail. That alone was sufficiently remarkable; but it was rendered more so by the fact that the plaited queue was a false one being attached to a most ingenious bald wig. "You're sure it wasn't part of a Chinese make-up?" questioned Weymouth, his eye on the strange relic. "Cadby was clever at disguise." Smith snatched the wig from my hands with a certain irritation, and tried to fit it on the dead detective. "Too small by inches!" he jerked. "And look how it's padded in the crown. This thing was made for a most abnormal head." He threw it down, and fell to pacing the room again. "Where did you find him--exactly?" he asked. "Limehouse Reach--under Commercial Dock Pier--exactly an hour ago." "And you last saw him at eight o'clock last night?"--to Weymouth. "Eight to a quarter past." "You think he has been dead nearly twenty-four hours, Petrie?" "Roughly, twenty-four hours," I replied. "Then, we know that he was on the track of the Fu-Manchu group, that he followed up some clew which led him to the neighborhood of old Ratcliff Highway, and that he died the same night. You are sure that is where he was going?" "Yes," said Weymouth; "He was jealous of giving anything away, poor chap; it meant a big lift for him if he pulled the case off. But he gave me to understand that he expected to spend last night in that district. He left the Yard about eight, as I've said, to go to his rooms, and dress for the job." "Did he keep any record of his cases?" "Of course! He was most particular. Cadby was a man with ambitions, sir! You'll want to see his book. Wait while I get his address; it's somewhere in Brixton." He went to the telephone, and Inspector Ryman covered up the dead man's face. Nayland Smith was palpably excited. "He almost succeeded where we have failed, Petrie," he said. "There is no doubt in my mind that he was hot on the track of Fu-Manchu! Poor Mason had probably blundered on the scent, too, and he met with a similar fate. Without other evidence, the fact that they both died in the same way as the dacoit would be conclusive, for we know that Fu-Manchu killed the dacoit!" "What is the meaning of the mutilated hands, Smith?" "God knows! Cadby's death was from drowning, you say?" "There are no other marks of violence." "But he was a very strong swimmer, Doctor," interrupted Inspector Ryman. "Why, he pulled off the quarter-mile championship at the Crystal Palace last year! Cadby wasn't a man easy to drown. And as for Mason, he was an R.N.R., and like a fish in the water!" Smith shrugged his shoulders helplessly. "Let us hope that one day we shall know how they died," he said simply. Weymouth returned from the telephone.