'She was livid,' replied Stockdale with a scowl. 'Nobody had told her that she ought to separate the message from the messenger. She more or less accused me of betraying her.'

'Did she give you any names?'

'Not at first – she refused to believe that anybody in her circle could be implicated in any way. It was only when I put it to her that one of them might inadvertently have passed on details of the coffee pot to someone else that she deigned to think again. Mrs Tomkins eventually provided the names of two people with a particular interest in that silver coffee pot.'

'Who are they?'

'The first one is Martha Pryde – she's the wife of Sir David Pryde, who owns the largest shipping line in Wales. Lady Pryde and Winifred Tomkins used to be very close but the frost seems to have got into that friendship. Heaven knows why,' he went on. 'I'd be interested to find out why the two of them fell out.'

'Would it be relevant to the investigation?'

'It could be, Inspector. Mrs Tomkins described Lady Pryde as acquisitive. I could add several other adjectives to that and none of them is very complimentary. Mrs Tomkins is only a well-bred harridan,' he said, 'whereas Lady Pryde is a venomous snake.'

'What about Sir David?'

'That's the curious thing. When I was leaving, Mr Tomkins mentioned something that might have a bearing on the case.'

Colbeck raised an eyebrow. 'Well?'

'Leonard Voke, the silversmith, was recommended to them by no less a person than Sir David Pryde.'

'Links of the chain are starting to join up,' said Colbeck, tasting more whisky. 'It must have been very galling for Lady Pryde if her former friend was boasting about a coffee pot locomotive made by someone suggested to her by Lady Pryde's own husband.'

Stockdale chuckled. 'Yes,' he said, 'I can imagine that Sir David got a flea in his ear for making that recommendation. Of course, that was at a time when they were friendly with Mr and Mrs Tomkins. Now they seem to be at daggers drawn. But,' he added, 'that's not the only link in the chain. Another name was mentioned.'