He nodded his head at Miss Marple.

‘Superintendent Blacker told me about you last night. Said you’d had a lot of experience of the seamy side of human nature. Well now, let’s have your point of view. Who’s the nigger in the woodpile? The G.I. husband?’

‘That,’ said Miss Marple, ‘would be very convenient for everybody.’

Inspector Curry smiled softly to himself.

‘A G.I. pinched my best girl,’ he said reminiscently. ‘Naturally, I’m prejudiced. His manner doesn’t help. Let’s have the amateur point of view. Who’s been secretly and systematically poisoning Mrs Serrocold?’

‘Well,’ said Miss Marple judicially, ‘one is always inclined, human nature being what it is, to think of the husband. Or if it’s the other way round, the wife. That’s the first assumption, don’t you think, in a poisoning case?’

‘I agree with you every time,’ said Inspector Curry.

‘But really — in this case — ’ Miss Marple shook her head. ‘No, frankly — I can not seriously consider Mr Serrocold. Because you see, Inspector, he really is devoted to his wife. Naturally he would make a parade of being so — but it isn’t a parade. It’s very quiet, but it’s genuine. He loves his wife, and I’m quite certain that he wouldn’t poison her.’

‘To say nothing of the fact that he wouldn’t have any motive for doing so. She’s made over her money to him already.’

‘Of course,’ said Miss Marple primly, ‘there are other reasons for a gentleman wanting his wife out of the way. An attachment to a young woman, for instance. But I really don’t see any signs of it in this case. Mr Serrocold does not act as though he had any romantic preoccupation. I’m really afraid,’ she sounded quite regretful about it, ‘we shall have to wash him out.’

‘Regrettable, isn’t it?’ said the Inspector. He grinned. ‘And anyway, he couldn’t have killed Gulbrandsen. It seems to me that there’s no doubt that the one thing hinges on the other. Whoever is poisoning Mrs Serrocold killed Gulbrandsen to prevent him spilling the beans. What we’ve got to get at now is who had an opportunity to kill Gulbrandsen last night. And our prize suspect — there’s no doubt about it — is young Walter Hudd. It was he who switched on a reading lamp which resulted in a fuse going, thereby giving him the opportunity to leave the Hall and go to the fuse box. The fuse box is in the kitchen passage which opens off from the main corridor. It was during his absence from the Great Hall that the shot was heard. So that’s suspect No. 1 perfectly placed for committing the crime.’

‘And suspect No. 2?’ asked Miss Marple.

‘Suspect No. 2 is Alex Restarick, who was alone in his car between the lodge and the house and took too long getting there.’

‘Anybody else?’ Miss Marple leaned forward eagerly — remembering to add: ‘It’s very kind of you to tell me all this.’

‘It’s not kindness,’ said Inspector Curry. ‘I’ve got to have your help. You put your finger on the spot when you said “Anybody else?” Because there I’ve got to depend on you. You were there, in the Hall last night, and you can tell me who left it…’