It wasn't a question of only Mr Gaskell or Mrs Jefferson; there was the further possibility of marriage.
If either of those two was married, or even was likely to marry, then the other party to the marriage contract was involved too.
Raymond, for instance, might think he had a pretty good chance of marrying a rich wife. He had been very assiduous to Mrs Jefferson, and it was his charm, I think, that awoke her from her long widowhood. She had been quite content just 'being a daughter to Mr Jefferson.' Like Ruth and Naomi only Naomi, if you remember, took a lot of trouble to arrange a suitable marriage for Ruth.
"Besides Raymond, there was Mr McLean.
She liked him very much, and it seemed highly possible that she would marry him in the end.
He wasn't well off and he was not far from Danemouth on the night in question.
So, it seemed, didn't it," said Miss Marple, "as though anyone might have done it?
But, of course, really, in my own mind, I knew.
You couldn't get away, could you, from those bitten nails?"
"Nails?" said Sir Henry. "But she tore her nail and cut the others."
"Nonsense," said Miss Marple. "Bitten nails and close-cut nails are quite different!
Nobody could mistake them who knew anything about girls' nails -very ugly, bitten nails, as I always tell the girls in my class.
Those nails, you see, were a fact. And they could only mean one thing. The body in Colonel Bantry's library wasn't Ruby Keene at all.
"And that brings you straight to the one person who must be concerned. Josie!
Josie identified the body.
She knew - she must have known - that it wasn't Ruby Keene's body. She said it was.
She was puzzled, completely puzzled, at finding that body where it was. She practically betrayed that fact.
Why?
Because she knew - none better - where it ought to have been found! In Basil Blake's cottage.
Who directed our attention to Basil?
Josie, by saying to Raymond that Ruby might have been with the film man.
And before that, by slipping a snapshot of him into Ruby's handbag.
Josie!
Josie, who was shrewd, practical, hard as nails and all out for money. "Since the body wasn't the body of Ruby Keene, it must be the body of someone else. Of whom? Of the other girl who was also missing. Pamela Reeves! Ruby was eighteen, Pamela sixteen. They were both healthy, rather immature, but muscular girls.
But why, I asked myself, all this hocus-pocus?
There could be only one reason: to give certain persons an alibi.
Who had alibis for the supposed time of Ruby Keene's death?
Mark Gaskell, Mrs Jefferson and Josie.
"It was really quite interesting, you know, tracing out the course of events, seeing exactly how the plan had worked out.
Complicated and yet simple.
First of all, the selection of the poor child, Pamela; the approach to her from the film angle. A screen test; of course the poor child couldn't resist it. Not when it was put up to her as plausibly as Mark Gaskell put it.
She comes to the hotel, he is waiting for her, he takes her in by the side door and introduces her to Josie, one of their make-up experts!
That poor child, it makes me quite sick to think of it! Sitting in Josie's bathroom while Josie bleaches her hair and makes up her face and varnishes her fingernails and toenails. During all this the drug was given. In an ice-cream soda, very likely. She goes off into a coma. I imagine that they put her into one of the empty rooms opposite. They were only cleaned once a week, remember.
"After dinner Mark Gaskell went out in his car to the sea front, he said.
That is when he took Pamela's body to the cottage, arranged it, dressed in one of Ruby's old dresses, on the hearth rug.
She was still unconscious, but not dead, when he strangled her with the belt of the frock.
Not nice, no, but I hope and pray she knew nothing about it. Really, I feel quite pleased to think of him hanging...
That must have been just after ten o'clock.
Then back at top speed and into the lounge where Ruby Keene, still alive, was dancing her exhibition dance with Raymond.
I should imagine that Josie had given Ruby instructions beforehand. Ruby was accustomed to doing what Josie told her. She was to change, go into Josie's room and wait.
She, too, was drugged; probably in the after-dinner coffee.
She was yawning, remember, when she talked to young Bartlett.
"Josie came up later with Raymond to 'look for her,' but nobody but Josie went into Josie's room.
She probably finished the girl off then with an injection, perhaps, or a blow on the back of the head.
She went down, danced with Raymond, debated with the Jeffersons where Ruby could be and finally went up to bed.
In the early hours of the morning she dressed the girl in Pamela's clothes, carried the body down the side stairs and out. She was a strong, muscular young woman. Fetched George Bartlett's car, drove two miles to the quarry, poured petrol over the car and set it alight.
Then she walked back to the hotel, probably timing her arrival there for eight or nine o'clock. Up early in her anxiety about Ruby!"
"An intricate plot," said Colonel Melchett.
"Not more intricate than the steps of a dance," said Miss Marple.
"I suppose not."