"I rather think that will be helpful," said he. He came over and stood in deep thought while the two professionals were examining the body. "You say that three people came out from the flat while you were waiting downstairs," said he at last. "Did you observe them closely?" "Yes, I did." "Was there a fellow about thirty, black-bearded, dark, of middle size?" "Yes; he was the last to pass me." "That is your man, I fancy. I can give you his description, and we have a very excellent outline of his footmark. That should be enough for you." "Not much, Mr. Holmes, among the millions of London." "Perhaps not. That is why I thought it best to summon this lady to your aid." We all turned round at the words. There, framed in the doorway, was a tall and beautiful woman--the mysterious lodger of Bloomsbury. Slowly she advanced, her face pale and drawn with a frightful apprehension, her eyes fixed and staring, her terrified gaze riveted upon the dark figure on the floor. "You have killed him!" she muttered. "Oh, Dio mio, you have killed him!" Then I heard a sudden sharp intake of her breath, and she sprang into the air with a cry of joy. Round and round the room she danced, her hands clapping, her dark eyes gleaming with delighted wonder, and a thousand pretty Italian exclamations pouring from her lips. It was terrible and amazing to see such a woman so convulsed with joy at such a sight. Suddenly she stopped and gazed at us all with a questioning stare. "But you! You are police, are you not? You have killed Giuseppe Gorgiano. Is it not so?" "We are police, madam." She looked round into the shadows of the room. "But where, then, is Gennaro?" she asked. "He is my husband, Gennaro Lucca. I am Emilia Lucca, and we are both from New York. Where is Gennaro? He called me this moment from this window, and I ran with all my speed." "It was I who called," said Holmes. "You! How could you call?" "Your cipher was not difficult, madam. Your presence here was desirable. I knew that I had only to flash 'Vieni' and you would surely come." The beautiful Italian looked with awe at my companion. "I do not understand how you know these things," she said. "Giuseppe Gorgiano--how did he--" She paused, and then suddenly her face lit up with pride and delight. "Now I see it! My Gennaro! My splendid, beautiful Gennaro, who has guarded me safe from all harm, he did it, with his own strong hand he killed the monster! Oh, Gennaro, how wonderful you are! What woman could ever be worthy of such a man?" "Well, Mrs. Lucca," said the prosaic Gregson, laying his hand upon the lady's sleeve with as little sentiment as if she were a Notting Hill hooligan, "I am not very clear yet who you are or what you are; but you've said enough to make it very clear that we shall want you at the Yard."