‘But I have a reason—a very good reason for asking.’

He spoke persuasively.

She seemed to consider, studying him attentively. Finally she made up her mind.

‘She was a bad lot, sir,’ she said quietly. ‘I wouldn’t say so before Joe. She took him in good and proper. That kind can—more’s the pity. You know how it is, sir.’

Yes, Sir Henry knew. The Joe Ellises of the world were peculiarly vulnerable. They trusted blindly. But for that very cause the shock of discovery might be greater.

He left the cottage baffled and perplexed. He was up against a blank wall. Joe Ellis had been working indoors all yesterday evening. Mrs Bartlett had actually been there watching him. Could one possibly get round that? There was nothing to set against it—except possibly that suspicious readiness in replying on Joe Ellis’s part—that suggestion of having a story pat.

‘Well,’ said Melchett, ‘that seems to make the matter quite clear, eh?’

‘It does, sir,’ agreed the Inspector. ‘Sandford’s our man. Not a leg to stand upon. The thing’s as plain as daylight. It’s my opinion as the girl and her father were out to—well—practically blackmail him. He’s no money to speak of—he didn’t want the matter to get to his young lady’s ears. He was desperate and he acted accordingly. What do you say, sir?’ he added, addressing Sir Henry deferentially.

‘It seems so,’ admitted Sir Henry. ‘And yet—I can hardly picture Sandford committing any violent action.’

But he knew as he spoke that that objection was hardly valid. The meekest animal, when cornered, is capable of amazing actions.

‘I should like to see the boy, though,’ he said suddenly. ‘The one who heard the cry.’

Jimmy Brown proved to be an intelligent lad, rather small for his age, with a sharp, rather cunning face. He was eager to be questioned and was rather disappointed when checked in his dramatic tale of what he had heard on the fatal night.

‘You were on the other side of the bridge, I understand,’ said Sir Henry. ‘Across the river from the village. Did you see anyone on that side as you came over the bridge?’

‘There was someone walking up in the woods. Mr Sandford, I think it was, the architecting gentleman who’s building the queer house.’

The three men exchanged glances.

‘That was about ten minutes or so before you heard the cry?’

The boy nodded.

‘Did you see anyone else—on the village side of the river?’

‘A man came along the path that side. Going slow and whistling he was. Might have been Joe Ellis.’

‘You couldn’t possibly have seen who it was,’ said the Inspector sharply. ‘What with the mist and its being dusk.’

‘It’s on account of the whistle,’ said the boy. ‘Joe Ellis always whistles the same tune—“I wanner be happy”—it’s the only tune he knows.’

He spoke with the scorn of the modernist for the old-fashioned.

‘Anyone might whistle a tune,’ said Melchett. ‘Was he going towards the bridge?’