‘Not necessarily. Anyone with basic writing skills, a devious mind and amateur knowledge of psychology can do it.’ Antonia hoped she didn’t sound too terse. She knew there was more to detective story writing than that but she was annoyed. They should talk about something else, really. ‘Who is Bobo Markham?’ she asked.

Lady Grylls laughed. It was Major Payne who enlightened her.

‘Sir Robert Markham is a widowed baronet who considers himself a good catch. Markham Manor is on the other side of Chalfont Parva,’ he explained. ‘Old Markham’s been trying to get Aunt Nellie to marry him. He’s been after you for a long time, hasn’t he, darling?’

‘Oh dear, yes… Heart of gold, but such an old bore. He’s nearly eighty,’ Lady Grylls said. ‘A man who continually asks a woman to marry him and can’t make her change her mind, is a man who secretly enjoys devotion to lost causes.’

‘He had a good war, apparently,’ Payne said. ‘He told me he excelled at Dunkirk.’

‘I daresay the Charge of the Light Brigade would have suited Bobo much better! I know I am being awfully unkind. I am not a good person. Bobo’s a splendid old boy, actually, but if I ever married again at my age, it would be to a younger man. Somebody of, say, sixty-four.’

‘Darling – a toy-boy,’ Payne murmured.

‘And he must on no account breed pigs.’

‘Does Sir Robert Markham breed pigs?’ Antonia was not in the least interested, but she was glad to have managed to steer the conversation in a different direction.

‘Listen to this. Corinne might be planning to get rid of the overbearing Maginot who has some hold over her.’ Payne paused thoughtfully. ‘It is Maginot who will die violently. Corinne is the killer and she has been making it appear as though she is the intended victim… It’s going to be one of those cases where it looks but only looks as though the killer has made a mistake.’