of the steam boiler." O'Reagan resumed deliberately, "where it had evidently been placed in a vain attempt to destroy it."

A shudder went through Mary, and she convulsively wrung her small hands together, as though to limber them from a cramp. But her fingers went back to the key.

"The murderer has been discovered," the detective slowly continued, and the operator kept along with his utterance word by word. "He killed Ravelli for revenge. It was a love affair." Here the girl grew whiter still, and the clicks became very slow, but they did not cease. O'Reagan's voice was cold and ruthless: "The motive of the murderer was revenge. His name is Gerald Heath."

All but the name flashed off on the wire. Mary Warriner's power to stir the key stopped at that. She did not faint. She did not make any outcry. For a moment she looked as though the soul had gone out of her body, leaving a corpse sitting there. A grievous wail of wind came through the trees, and a streak of lightning zig-zagged down the blue-clouded sky.

"Go on," said O'Reagan.

"I will not," was the determined response.

"Why not?"

"Because it is not so. Gerald Heath never murdered Ravelli."

Gerald had stood motionless and silent. Now he gave way to an impulse as remarkable as his previous composure had been singular. If there had been stagnation in his mind, it was now displaced by turbulence. He grasped Mary's hands in a fervid grip; then dropped them and faced the others.

"I did not kill the Italian," he said. "He attacked me with my knife which he had stolen. In the struggle his hand was cut, but I took the weapon away from him. He quitted me alive and unhurt. I never saw him again. You don't believe it? Mary does, and that is more than all else."

"The circumstances don't favor you," the detective retorted, "they convict you. You killed Ravelli because you and he were both in love with this young lady."

"Isn't it the rejected suitor who kills the other one for spite?" This was in Mary Warriner's voice, weak, but still steady. "Ravelli loved me, I knew, and I drove him away. Mr. Heath loved me, I believed, and I had not repulsed him. If I were the cause of a murder between them, it should be Ravelli who killed Gerald."

"You detested Ravelli?" O'Reagan asked, with a 

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