The body was removed, and an autopsy has been held.

And the conclusion of the medical men is that this woman has been secretly and subtly poisoned." Here the official paused, rang a bell, and remained silent until a quiet-looking, middle-aged man who might have been a highly respectable butler entered the room: then he turned again to his visitors.
"I want you, Miss Lennard, to accompany this man--one of my officers--to the mortuary, to see if you can identify the body I have told you of.
Perhaps you gentlemen will accompany Miss Lennard?
Then," he continued, rising, "if you will all return here, we will go into this matter further, and see if we can throw more light on it." Allerdyke's next impressions were of a swift drive across London to a quiet retreat in Paddington, where, in a red-brick building set amidst trees, official-faced men conducted him and his two companions into a sort of annex, one side of which was covered with sheet glass.

On the other side of that glass he became aware of a still figure, shrouded and arranged in formal lines, of a white face, set amidst dark hair ...

then as in a dream he heard Celia Lennard's frightened whisper-- "That's she--that's Lisette! Oh, for God's sake, take me out!".