"I'm very ill," she moaned. "Something hurts so! My hat-pin----" And her voice trailed into silence. "Poor child!" the man exclaimed, completely taken in at last. The hat-pin was sticking in very deep! Not that she minded a little pain. But the great thing was to keep O'Reilly's hands busy. Clumsily, obstinately, he fumbled among the meshes of ostrich plume wound around her hat. The head of the pin eluding him there, he tried beneath the brim, his fingers tangling in thick waves of hair. They were soft waves, softer and silkier than the ostrich plume. No man with blood in his veins could have touched them without a thrill. The girl on his breast, her face on his arm, one hand holding her up, another caught in her hair, O'Reilly was conscious of electric shocks. His hands and attention thus engaged, Clo got the chance she'd waited for. Delicately, stealthily, like the "mouse" she called herself, she extracted the door key from O'Reilly's pocket. So far, so good. But the next deed would try her mettle. Lightly as a flitting shadow the small fingers moved over the man's waistcoat, from the belt line to the breast. She could feel his heart thump, and almost started, but controlled herself. Clo had noticed that men often wore a short chain or ribbon, attached to a watch, and hanging from the waistcoat pocket with a seal, a society badge or a lucky souvenir. O'Reilly wore no ornament of that sort; but there was a watch, a thin watch which she could feel through the cloth, and some flat object with it. If she could slip a finger into that pocket without his knowing! But now they were in Park Avenue, not far from the imposing apartment house at the corner, where Mr. and Mrs. Sands lived. Clo availed herself of a slight bump, and showed signs of sliding off the seat. O'Reilly, who had just extracted the hat-pin and stuck it into his coat, steadied her with an effort. Fortunately there was no need to look out and stop the chauffeur. That afternoon O'Reilly had passed the building, informed by Count Lovoresco who lived there, and had looked up with a certain curiosity. He remembered the number, and in leaving the Dietz had been able to give the address. The taxi stopped, and O'Reilly prepared to carry the fainting girl into the house. She would be a light load. As he got out of the taxi with Clo in his arms a man came forward. "Won't you let me help you, sir?" he civilly inquired. "You may run ahead," said O'Reilly. "I can manage the young lady myself." The man who had offered his services disappeared into the house, and found the porter, a substantial person in livery. Clo conveniently revived when placed on the seat of the lift. O'Reilly sat by her side, supporting the limp body, her hat in his hand, while the porter shot the elevator up to the Sands' floor.