one of those ordered by her three days before she died? Does she
know whether the same person has done the same thing with those
later ordered by Mr. Vandam?"

"John" seemed considerably perturbed at the mention of capsules.
It was a long time before any answer was forthcoming. Kennedy was
about to repeat the question when a faint sound was heard.

Rap! -

Suddenly came a wild scream. It was such a scream as I had never
heard before in my life. It came as though a dagger had been
thrust into the heart of Mrs. Popper. The lights flashed up as
Kennedy turned the switch.

A man was lying flat on the floor--it was Inspector O'Connor. He
had succeeded in slipping noiselessly, like a snake, below the
curtain into the cabinet. Craig had told him to look out for
wires or threads stretched from Mrs. Popper's clothing to the
bulging curtain of the cabinet. Imagine his surprise when he saw
that she had simply freed her foot from the shoe, which I was
carefully holding down, and with a backward movement of the leg
was reaching out into the cabinet behind her chair and was doing
the rapping with her toes.

Lying on the floor he had grasped her foot and caught her heel
with a firm hand. She had responded with a wild yell that showed
she knew she was trapped. Her secret was out.

Hysterically Mrs. Popper began to upbraid the inspector as he