Mrs Otterbourne shook her head vigorously.

‘No, no. I am practically a teetotaller. You may have noticed I never drink anything but water – or perhaps lemonade. I cannot bear the taste of spirits.’

‘Then may I order you a lemon squash, Madame?’

He gave the order – one lemon squash and one benedictine.

The swing door revolved. Rosalie passed through and came towards them, a book in her hand.

‘Here you are,’ she said. Her voice was quite expressionless – almost remarkably so.

‘Monsieur Poirot has just ordered me a lemon squash,’ said her mother.

‘And you, Mademoiselle, what will you take?’

‘Nothing.’ She added, suddenly conscious of the curtness: ‘Nothing, thank you.’

Poirot took the volume which Mrs Otterbourne held out to him. It still bore its original jacket, a gaily coloured affair representing a lady with smartly shingled hair and scarlet fingernails sitting on a tiger skin in the traditional costume of Eve. Above her was a tree with the leaves of an oak, bearing large and improbably coloured apples.

It was entitled Under the Fig Tree, by Salome Otterbourne. On the inside was a publisher’s blurb. It spoke enthusiastically of the superb courage and realism of this study of a modern woman’s love life. Fearless, unconventional, realistic were the adjectives used.

Poirot bowed and murmured:

‘I am honoured, Madame.’

As he raised his head, his eyes met those of the authoress’s daughter. Almost involuntarily he made a little movement. He was astonished and grieved at the eloquent pain they revealed.

It was at that moment that the drinks arrived and created a welcome diversion.

Poirot lifted his glass gallantly.

‘A votre santé, Madame – Mademoiselle.’

Mrs Otterbourne, sipping her lemonade, murmured:

‘So refreshing – delicious.’

Silence fell on the three of them. They looked down to the shining black rocks in the Nile. There was something fantastic about them in the moonlight. They were like vast prehistoric monsters lying half out of the water. A little breeze came up suddenly and as suddenly died away. There was a feeling in the air of hush – of expectancy.

Hercule Poirot brought his gaze to the terrace and its occupants. Was he wrong, or was there the same hush of expectancy there? It was like a moment on the stage when one is waiting for the entrance of the leading lady.

And just at that moment the swing doors began to revolve once more. This time it seemed as though they did so with a special air of importance. Everyone had stopped talking and was looking towards them.

A dark slender girl in a wine-coloured evening frock came through. She paused for a minute, then walked deliberately across the terrace and sat down at an empty table. There was nothing flaunting, nothing out of the way about her demeanour, and yet it had somehow the studied effect of a stage entrance.

‘Well,’ said Mrs Otterbourne. She tossed her turbaned head. ‘She seems to think she is somebody, that girl!’

Poirot did not answer. He was watching. The girl had sat down in a place where she could look deliberately across at Linnet Doyle. Presently, Poirot noticed, Linnet Doyle leant forward and said something and a moment later got up and changed her seat. She was now sitting facing in the opposite direction.

Poirot nodded thoughtfully to himself.

It was about five minutes later that the other girl changed her seat to the opposite side of the terrace. She sat smoking and smiling quietly, the picture of contented ease. But always, as though unconsciously, her meditative gaze was on Simon Doyle’s wife.

After a quarter of an hour Linnet Doyle got up abruptly and went into the hotel. Her husband followed her almost immediately.

Jacqueline de Bellefort smiled and twisted her chair round. She lit a cigarette and stared out over the Nile. She went on smiling to herself.

‘Monsieur Poirot.’

Poirot got hastily to his feet. He had remained sitting out on the terrace alone after everyone else had left. Lost in meditation, he had been staring at the smooth shiny black rocks when the sound of his name recalled him to himself.

It was a well-bred, assured voice, a charming voice, although perhaps a trifle arrogant.

Hercule Poirot, rising quickly, looked into the commanding eyes of Linnet Doyle. She wore a wrap of rich purple velvet over her white satin gown and she looked more lovely and more regal than Poirot had imagined possible.

‘You are Monsieur Hercule Poirot?’ said Linnet.

It was hardly a question.

‘At your service, Madame.’

‘You know who I am, perhaps?’

‘Yes, Madame. I have heard your name. I know exactly who you are.’

Linnet nodded. That was only what she had expected. She went on, in her charming autocratic manner:

‘Will you come with me into the card room, Monsieur Poirot? I am very anxious to speak to you.’

‘Certainly, Madame.’

She led the way into the hotel. He followed. She led him into the deserted card room and motioned him to close the door. Then she sank down on a chair at one of the tables and he sat down opposite her.

She plunged straightaway into what she wanted to say. There were no hesitations. Her speech came flowingly.

‘I have heard a great deal about you, Monsieur Poirot, and I know that you are a very clever man. It happens that I am urgently in need of someone to help me – and I think very possibly that you are the man who could do it.’

Poirot inclined his head.

‘You are very amiable, Madame. But you see, I am on holiday, and when I am on holiday I do not take cases.’

‘That could be arranged.’

It was not offensively said – only with the quiet confidence of a young woman who had always been able to arrange matters to her satisfaction.

Linnet Doyle went on:

‘I am the subject, Monsieur Poirot, of an intolerable persecution. That persecution has got to stop! My own idea was to go to the police about it, but my – my husband seems to think that the police would be powerless to do anything.’

‘Perhaps – if you would explain a little further?’ murmured Poirot politely.

‘Oh, yes, I will do so. The matter is perfectly simple.’

There was still no hesitation – no faltering. Linnet Doyle had a clear-cut businesslike mind. She only paused a minute so as to present the facts as concisely as possible.

‘Before I met my husband, he was engaged to a Miss de Bellefort. She was also a friend of mine. My husband broke off his engagement to her – they were not suited in any way. She, I am sorry to say, took it rather hard… I – am very sorry about that – but these things cannot be helped. She made certain – well, threats – to which I paid very little attention, and which, I may say, she has not attempted to carry out. But instead she has adopted the extraordinary course of – of following us about wherever we go.’

Poirot raised his eyebrows.

‘Ah – rather an unusual – er – revenge.’

‘Very unusual – and very ridiculous! But also – annoying.’

She bit her lip.

Poirot nodded.

‘Yes, I can imagine that. You are, I understand, on your honeymoon?’

‘Yes. It happened – the first time – at Venice. She was there – at Danielli’s. I thought it was just coincidence. Rather embarrassing, but that was all. Then we found her on board the boat at Brindisi. We – we understood that she was going on to Palestine. We left her, as we thought, on the boat. But – but when we got to Mena House she was there – waiting for us.’

Poirot nodded.

‘And now?’

‘We came up the Nile by boat. I–I was half expecting to find her on board. When she wasn’t there I thought she had stopped being so – so childish. But when we got here – she – she was here – waiting.’