“Certainly not.”

We all trooped out into the corridor, leaving the two doctors alone, and I heard the key turned in the lock behind us.

We went slowly down the stairs. I was violently excited. I have a certain talent for deduction, and Dr. Bauerstein’s manner had started a flock of wild surmises in my mind. Mary Cavendish laid her hand upon my arm.

“What is it? Why did Dr. Bauerstein seem so—peculiar?”

I looked at her.

“Do you know what I think?”

“What?”

“Listen!” I looked round, the others were out of earshot. I lowered my voice to a whisper. “I believe she has been poisoned! I’m certain Dr. Bauerstein suspects it.”

What?” She shrank against the wall, the pupils of her eyes dilating wildly. Then, with a sudden cry that startled me, she cried out: “No, no—not that—not that!” And breaking from me, fled up the stairs. I followed her, afraid that she was going to faint. I found her leaning against the bannisters, deadly pale. She waved me away impatiently.

“No, no—leave me. I’d rather be alone. Let me just be quiet for a minute or two. Go down to the others.”