‘Her clothes were found lying on the beach in a secluded cove nearby, and it seemed clear that she had undressed there and swum resolutely out to sea where the current was known to be dangerous, sweeping one down the coast.

‘The body was not recovered, but after a time leave was given to presume death. She was a rich woman, her estate being proved at a hundred thousand pounds. Since she died intestate it all went to her next of kin—a family of cousins in Australia. The papers made discreet references to the tragedy in the Canary Islands, putting forward the theory that the death of Miss Durrant had unhinged her friend’s brain. At the inquest the usual verdict of Suicide whilst temporarily insane was returned.

‘And so the curtain falls on the tragedy of Amy Durrant and Mary Barton.’

There was a long pause and then Jane Helier gave a great gasp.

‘Oh, but you mustn’t stop there—just at the most interesting part. Go on.’

‘But you see, Miss Helier, this isn’t a serial story. This is real life; and real life stops just where it chooses.’

‘But I don’t want it to,’ said Jane. ‘I want to know.’

‘This is where we use our brains, Miss Helier,’ explained Sir Henry. ‘Why did Mary Barton kill her companion? That’s the problem Dr Lloyd has set us.’

‘Oh, well,’ said Miss Helier, ‘she might have killed her for lots of reasons. I mean—oh, I don’t know. She might have got on her nerves, or else she got jealous, although Dr Lloyd doesn’t mention any men, but still on the boat out—well, you know what everyone says about boats and sea voyages.’

Miss Helier paused, slightly out of breath, and it was borne in upon her audience that the outside of Jane’s charming head was distinctly superior to the inside.

‘I would like to have a lot of guesses,’ said Mrs Bantry. ‘But I suppose I must confine myself to one. Well, I think that Miss Barton’s father made all his money out of ruining Amy Durrant’s father, so Amy determined to have her revenge. Oh, no, that’s the wrong way round. How tiresome! Why does the rich employer kill the humble companion? I’ve got it. Miss Barton had a young brother who shot himself for love of Amy Durrant. Miss Barton waits her time. Amy comes down in the world. Miss B. engages her as companion and takes her to the Canaries and accomplishes her revenge. How’s that?’

‘Excellent,’ said Sir Henry. ‘Only we don’t know that Miss Barton ever had a young brother.’

‘We deduce that,’ said Mrs Bantry. ‘Unless she had a young brother there’s no motive. So she must have had a young brother. Do you see, Watson?’

‘That’s all very fine, Dolly,’ said her husband. ‘But it’s only a guess.’

‘Of course it is,’ said Mrs Bantry. ‘That’s all we can do—guess. We haven’t got any clues. Go on, dear, have a guess yourself.’

‘Upon my word, I don’t know what to say. But I think there’s something in Miss Helier’s suggestion that they fell out about a man. Look here, Dolly, it was probably some high church parson. They both embroidered him a cope or something, and he wore the Durrant woman’s first. Depend upon it, it was something like that. Look how she went off to a parson at the end. These women all lose their heads over a good-looking clergyman. You hear of it over and over again.’