But, I suppose, it could not have been that.
It was Lord Robert who told us nearly everything; and always I was conscious that he was watching me, wondering if this were a cruel blow for me, asking himself if he were speaking in a tactful way of one who had been his rival.
"There was that engagement of Dundas' last night, which he was just going to keep when we saw him," said Lord Bob, carefully, but clumsily.
"I'm afraid there must have been something fishy about that--I mean, some trap must have been laid to catch him.

And, it seems, he wasn't supposed to be in Paris--though I don't see what that can have to do with the plot, if there is one.

He was stopping in the hotel under another name.

No doubt he had some good reason, though.

There's nothing sly about Dundas.