Lady Bridget suddenly lifting eyes that were instantly wide open, became aware of the man's presence.

The effect of it upon her was so marked that McKeith, watching her face, felt a shock of surprise.

The change in her was noticed by the Police Inspector, with malevolent curiosity.

So also by Mrs Hensor, a little further away.
The new-comer saluted her with a low bow, his hat in one hand, the other extended.
'You haven't forgotten me, I hope, Lady Bridget, though I should think that I am the very last person in the world you would have expected to see in these parts.' Lady Bridget had turned very white.

She stared at him as if he had been a ghost, and at first seemed unable to speak.