And now, please, we will talk of the tennis.

I do not know whether it is my fancy, but that man there to your left, in grey, seems to me to be taking an interest in our conversation.
He cannot possibly overhear, and he has not glanced once in our direction, yet I have an instinct for these things." Immelan glanced in the direction of the stranger,--a quiet-looking, spare man dressed in a grey tweed suit, clean-shaven and of early middle-age.

There was nothing about his appearance to distinguish him from a score or more of other loiterers.
"You are quite right," her companion admitted.

"One should not talk of these things even where the birds may listen, but it is so difficult.

As for that man, he could not possibly hear, but there might be others.