Penny Driver, Hercule Poirot and others in “Unfinished Business”

So you knew all along that it wasn't Brian, then?

Hercule Poirot

Oui, mademoiselle. But Monsieur Martin was not alone in his dislike for Lady Edgware. [to Miss Carroll] You, Miss Carroll. When I asked you the identity of the woman you saw entering the hall of Regent Gate...

[flashback, talking to Poirot and Hastings] It was her. I'd know her anywhere. And I saw her quite clearly.

Hercule Poirot

But you were standing high up on the landing. The person who entered that night wore a hat with a slanting brim. From where you were standing, it would have been impossible to see the face.

I saw her.

Hercule Poirot

Non, mademoiselle. You saw, I think, what you wished to see, hein? The woman who had wronged the man you had well served.

It's true. She never deserved him.

Hercule Poirot

And it would have been impossible for Jane Wilkinson to have committed the murder. Because as we now know, Jane Wilkinson changed her mind and attended the dinner at Holborn. [to everyone] But from the beginning, I have been perplexed by five questions. One: What happened to the letter written by Lord Edgware informing his wife that he had agreed to the divorce? Two: Who is this letter P on the little gold medicine box? Three: Who made the telephone call to Jane Wilkinson at the dinner at Holborn? Four: How did a pair of pince-nez come to be discovered in the handbag of Carlotta Adams? And five: Why did the letter of Carlotta Adams state quite clearly that it was Ronald Marsh who paid to her the sum of $2,000 when it was impossible he could have afforded that sum?

Do you have the answers?

Of course Mr. Poirot has the answers. That's why you're here.