‘Yes, it was rather rough luck on Miss Barton—or Miss Amy Durrant—whatever you like to call her. I became a ship’s doctor for a while, and landing in Melbourne, the first person I saw as I walked down the street was the lady I thought had been drowned in Cornwall. She saw the game was up as far as I was concerned, and she did the bold thing—took me into her confidence. A curious woman, completely lacking, I suppose, in some moral sense. She was the eldest of a family of nine, all wretchedly poor. They had applied once for help to their rich cousin in England and been repulsed, Miss Barton having quarrelled with their father. Money was wanted desperately, for the three youngest children were delicate and wanted expensive medical treatment. Amy Barton then and there seems to have decided on her plan of cold-blooded murder. She set out for England, working her passage over as a children’s nurse. She obtained the situation of companion to Miss Barton, calling herself Amy Durrant. She engaged a room and put some furniture into it so as to create more of a personality for herself. The drowning plan was a sudden inspiration. She had been waiting for some opportunity to present itself. Then she staged the final scene of the drama and returned to Australia, and in due time she and her brothers and sisters inherited Miss Barton’s money as next of kin.’

‘A very bold and perfect crime,’ said Sir Henry. ‘Almost the perfect crime. If it had been Miss Barton who had died in the Canaries, suspicion might attach to Amy Durrant and her connection with the Barton family might have been discovered; but the change of identity and the double crime, as you may call it, effectually did away with that. Yes, almost the perfect crime.’

‘What happened to her?’ asked Mrs Bantry. ‘What did you do in the matter, Dr Lloyd?’

‘I was in a very curious position, Mrs Bantry. Of evidence as the law understands it, I still have very little. Also, there were certain signs, plain to me as a medical man, that though strong and vigorous in appearance, the lady was not long for this world. I went home with her and saw the rest of the family—a charming family, devoted to their eldest sister and without an idea in their heads that she might prove to have committed a crime. Why bring sorrow on them when I could prove nothing? The lady’s admission to me was unheard by anyone else. I let Nature take its course. Miss Amy Barton died six months after my meeting with her. I have often wondered if she was cheerful and unrepentant up to the last.’

‘Surely not,’ said Mrs Bantry.

‘I expect so,’ said Miss Marple. ‘Mrs Trout was.’

Jane Helier gave herself a little shake.