I drove Vance’s car back to the city. Markham and Heath sat in the rear seat with the girl between them. Hardly a word was spoken during the entire hour-and-a-half’s ride. Several times I glanced behind me at the silent trio. Markham and the Sergeant appeared completely stunned by the surprising truth that had just been revealed to them. Ada, huddled between them, sat apathetically with closed eyes, her head forward. Once I noticed that she pressed a handkerchief to her face with her manacled hands; and I thought I heard the sound of smothered sobbing. But I was too nervous to pay any attention. It took every effort of my will to keep my mind on my driving.

As I drew up before the Franklin Street entrance of the Criminal Courts Building and was about to shut off the engine, a startled exclamation from Heath caused me to release the switch.

“Holy Mother o’ God!” I heard him say in a hoarse voice. Then he thumped me on the back. “Get to the Beekman Street Hospital—as quick as hell, Mr. Van Dine. Damn the traffic lights! Step on it!”

Without looking round I knew what had happened. I swung the car into Centre Street again, and fairly raced for the hospital. We carried Ada into the emergency ward, Heath bawling loudly for the doctor as we passed through the door.

It was more than an hour later when Vance entered the District Attorney’s office, where Markham and Heath and I were waiting. He glanced quickly round the room and then looked at our faces.

“I told you to watch her, Sergeant,” he said, sinking into a chair; but there was neither reproach nor regret in his voice.

None of us spoke. Despite the effect Ada’s suicide had had on us, we were waiting, with a kind of conscience-stricken anxiety, for news of the other girl whom all of us, I think, had vaguely suspected.

Vance understood our silence, and nodded reassuringly.

“Sibella’s all right. I took her to the Trinity Hospital in Yonkers. A slight concussion—Ada had struck her with a box-wrench which was always kept under the front seat. She’ll be out in a few days. I registered her at the hospital as Mrs. Von Blon, and then phoned her husband. I caught him at home, and he hurried out. He’s with her now. Incidentally, the reason we didn’t reach him at Mrs. Riglander’s is because he stopped at the office for his medicine-case. That delay saved Sibella’s life. Otherwise, I doubt if we’d have reached her before Ada had run her over the precipice in the machine.”

He drew deeply on his cigarette for a moment. Then he lifted his eyebrows to Markham.