The immaculately dressed young man in the office turned Field's card over doubtfully. He had every desire to oblige, he said, but really the house was packed to its utmost capacity. Also the well-dressed young man hoped that there would be nothing to disturb the harmony of the proceedings. "You may make your mind quite easy on that score," said Field with a reassuring smile. "There will be no disturbance as far as I am concerned. I want to identify somebody whom I believe is in the house, and when that is done my work is finished. Never mind about a seat--let me stand by the side of the stalls so that I can pass for an official." There was no difficulty whatever about this, and therefore Field stepped into the house as the curtain was going up on the last of the brilliant trifles of the evening. The house was packed to its utmost capacity with an audience that seemed decidedly to appreciate the bill of fare that had been prepared for their delectation. Field glanced round the house with his usual blank way that nevertheless took in everything. Most of the people in the stalls were known by sight to him. In an upper box on the prompt side he saw the dark face and eager eyes of the Rajah of Ahbad. He seemed to be looking for somebody, for his glasses were constantly in use. There was a restless air, too, about the Rajah, that showed that he was not altogether at his ease. "We live and learn," Field told himself. "I wonder what yonder wily oriental would think if he knew all that I have discovered lately. I suppose one of his favourite ballet girls is in the piece. Pretty piece, too, and pretty music." Field laid himself out for enjoyment for the next quarter of an hour. The heroine of the piece in the form of Miss Adela Vane was late in appearing. The thing was dragging, too, or so it seemed to Field. All at once there were voices at the back of the stage as if somebody was quarrelling. Suddenly the bright tuneful chorus broke off altogether and a female voice screamed. A little puff of smoke came from the stage. In the twinkling of an eye the whole house rose and shuddered. There was a sharp crack-crackle, followed by smoke, and forked tongues of flame licked the imitation forest, and with a swish all the chorus fled from the stage. Far away up in the gallery somebody was roaring "Fire!" A rush to the doors was already taking place. From the stalls rose a tall man with a military air, who commanded everybody to wait. There was no danger, he cried, if the audience only kept their heads. On the stage a manager, with a white face and a perspiring forehead, announced the fact that the appliances for dealing with the fire were of the finest possible description, and that there was no danger at all.