‘And her hat? You didn’t notice anything special about that.’

‘No, nothing.’

‘It hadn’t, for example, a wide brim?’

‘A wide brim? Not that I noticed. But it may have had.’

‘Was it windy where they were sitting?’

‘Every place was windy that day. It was an abominable crossing.’

‘So that if it had had a wide brim, the lady would have had difficulty in keeping it on?’

‘Possibly,’ replied Mr. Gordon a trifle dryly, ‘but you probably can form an opinion on that as well as I.’

Burnley smiled.

‘We Scotland Yard people like to know everything,’ he said. ‘And now, Mr. Gordon, I have to express my thanks for your courtesy and help.’