They repeated their search through music room, bedrooms, dressing-rooms, and passages, but all to no purpose. They could find no trace of their master.

Mr Parkes was slightly perturbed. An idea had recurred to him which had entered his mind on various previous occasions. He glanced inquiringly at the valet, as if uncertain whether or not to unburden his mind. Finally he said in a low tone:

‘Has it ever struck you, Innes, that Sir William was apoplectic?’

‘Apoplectic?’ returned the other. ‘Why, no, I don’t think it has.’

‘Well, it has me, and more than once. If he’s annoyed he gets that red. I’ve thought to myself when he has got into a temper about something, “Maybe,” I’ve thought, “maybe some of these days you’ll pop off in a fit if you’re not careful.” ’

‘You don’t say, Mr Parkes,’ exclaimed Innes, in a tone of thrilled interest.

‘I do. I’ve thought it. And I’ve thought too,’ the butler went on impressively, ‘that maybe something like this would happen: that we’d miss him, and go and look, and find him lying somewhere unconscious.’

‘Bless my soul, Mr Parkes, I hope not.’

‘I hope not too. But I’ve thought it.’ Mr Parkes shook his head gravely. ‘And what’s more,’ he went on after a few moments, ‘keeping this idea in view, I doubt if our search was sufficiently comprehensive. If Sir William had fallen behind a piece of furniture we might not have seen him.’

‘We could go round again, Mr Parkes, if you think that.’