‘But I suppose there aren’t very many of those?’ said Mrs Bantry.

‘Aren’t there?’

‘Sir Henry! You don’t mean there are?’

‘I should think,’ said Miss Marple thoughtfully, ‘that there must be a very large number.’

The charming old lady, with her old-world unruffled air, made her statement in a tone of the utmost placidity.

‘My dear Miss Marple,’ said Colonel Bantry.

‘Of course,’ said Miss Marple, ‘a lot of people are stupid. And stupid people get found out, whatever they do. But there are quite a number of people who aren’t stupid, and one shudders to think of what they might accomplish unless they had very strongly rooted principles.’

‘Yes,’ said Sir Henry, ‘there are a lot of people who aren’t stupid. How often does some crime come to light simply by reason of a bit of unmitigated bungling, and each time one asks oneself the question: If this hadn’t been bungled, would anyone ever have known?’

‘But that’s very serious, Clithering,’ said Colonel Bantry. ‘Very serious, indeed.’

‘Is it?’

‘What do you mean! It is! Of course it’s serious.’

‘You say crime goes unpunished; but does it? Unpunished by the law perhaps; but cause and effect works outside the law. To say that every crime brings its own punishment is by way of being a platitude, and yet in my opinion nothing can be truer.’

‘Perhaps, perhaps,’ said Colonel Bantry. ‘But that doesn’t alter the seriousness—the—er—seriousness—’ He paused, rather at a loss.

Sir Henry Clithering smiled.

‘Ninety-nine people out of a hundred are doubtless of your way of thinking,’ he said. ‘But you know, it isn’t really guilt that is important—it’s innocence. That’s the thing that nobody will realize.’

‘I don’t understand,’ said Jane Helier.

‘I do,’ said Miss Marple. ‘When Mrs Trent found half a crown missing from her bag, the person it affected most was the daily woman, Mrs Arthur. Of course the Trents thought it was her, but being kindly people and knowing she had a large family and a husband who drinks, well—they naturally didn’t want to go to extremes. But they felt differently towards her, and they didn’t leave her in charge of the house when they went away, which made a great difference to her; and other people began to get a feeling about her too. And then it suddenly came out that it was the governess. Mrs Trent saw her through a door reflected in a mirror. The purest chance—though I prefer to call it Providence. And that, I think, is what Sir Henry means. Most people would be only interested in who took the money, and it turned out to be the most unlikely person—just like in detective stories! But the real person it was life and death to was poor Mrs Arthur, who had done nothing. That’s what you mean, isn’t it, Sir Henry?’

‘Yes, Miss Marple, you’ve hit off my meaning exactly. Your charwoman person was lucky in the instance you relate. Her innocence was shown. But some people may go through a lifetime crushed by the weight of a suspicion that is really unjustified.’