Brett had gone thus far in his spoken commentary on the affair as it now presented itself to his mind when Winter asked: "Why do you say 'recognised' him, Mr. Brett? We have no evidence that Sir Alan had ever seen Ooma?" "What, none? Search through your memory. Did not the stationmaster see a third David Hume leave the station that day when the movements of only two are known to us. What became of this third personage during the afternoon? Where did he change into evening dress? Why did Sir Alan leave documents of such grave importance in so insecure a hiding-place?" "There is no use in asking me questions I can't answer," snapped the detective. "Perhaps not. I think you said that you amused yourself in your Middle Street lodgings by taking to pieces a small electrical machine fitted together by your companion?" "Yes, sir; but what of that?" "Let us suppose that, instead of a complex machine he built a small arch of toy bricks, and you were well acquainted with the model whilst each brick was numbered in rotation, don't you think you could manage to reconstruct the arch after repeated efforts?" "I expect so." "Well, my dear Winter, we have now got together every material stone in our edifice. Mrs. Capella's yielding to blackmail is the keystone of the arch. Every loose block fits at once into its proper place. The Japanese, Ooma, must have met Sir Alan and discussed this very question with him. The baronet must have unwittingly revealed the family secret, and the Jap was clever enough to perceive its value. Further, the murder was unpremeditated, the inspiration of a desperate moment, and the weapon selected shows a sort of fiendish mandate suggested by family feud. Ooma is undoubtedly--" But Smith entered, apologetic, doubtful. "Mr. Holden is here, sir, and says he wishes to see you immediately." Holden's news was important. Capella had left Liverpool Street half an hour ago for Beechcroft, and in the same train travelled Ooma. "Are you sure of this?" demanded Brett, excitedly springing from his chair. "Quite certain, sir. Mr. Winter's mate followed him to the station, and told me who the Japanese was. Besides, no one could mistake him who had ever seen either of these two gentlemen." He indicated Robert and David. "Quick," shouted the barrister. "We must all catch the next train to Stowmarket. Winter, have you your handcuffs? This time they may be needed. Smith, run and call two hansoms." He rushed to a bureau and produced a couple of revolvers. He handed one to Holden. "I can trust you," he said, "not to fire without reason. Do not shoot to kill. If this man threatens the life of any person, maim him if possible, but try to avoid hitting him in the head or body." To the Frazers he handed the heaviest sticks he possessed. He himself pocketed the second revolver, and picked up the peculiar walking-stick which Ooma dropped in Northumberland Avenue.