"The devil I did!" gasped the doctor. "What were you doing there?"

"Helping Saranoff capture you, Doctor," she replied. "The day you left, I saw one of his men on the street. I dared not summon help lest he should escape, so I followed him. I captured him and learned from him the location of the gang headquarters.

"I disguised myself and took his place for a week, fooling them all, even Saranoff himself. I was one of those chosen to carry out your capture and your murder. This afternoon, unknown to Saranoff, I tampered with that radite can and removed the fuse. That was why there was no explosion when Mr. Carnes cut the wire. I had no chance to warn him. I managed to shoot one of Saranoff's men when they broke and ran."

Her voice trembled in the darkness.

"I hated to kill him--" she said with a half sob.

A faint hail came from the night.

"Haggerty!" cried Carnes.

"All right, Chief," came Dillon's voice. "He's got a bullet in his shoulder and one through his leg, but no bones broken. He'll be all right."

Carnes turned again to the girl.

"What about that Russian whose place you took?" he asked. "Maybe we can pump something out of him."

Thelma swayed for a moment.

"Don't, Mr. Carnes," she cried, her voice rising almost to a shriek.

"Don't make me think of it! I--I had to--to stab him!"

She swayed again. Carnes started toward her, his arms outstretched.

Dr. Bird's voice stopped him.

"Miss Andrews," said the doctor sternly, "you know that I demand control of the emotions from all my subordinates. You are crying like a hysterical schoolgirl. Unless you can learn to control your feelings instead of giving way to them on every occasion, I will have to dispense with your further services."

The girl swayed toward him for a moment, a look of pain in her eyes.

She shuddered and then recovered herself. She straightened up and faced Dr. Bird boldly.

"Yes, Doctor," came in level expressionless tones from her lips.