"But he has evidently been watching us.

Quite possibly the lamented Stroebel employed him.

He may have seen Stroebel here--" Chauvenet again struck the table smartly.
"Of course he would see Stroebel! Stroebel was the Archduke's friend; Stroebel and this fellow between them--" "Stroebel is dead.

The Archduke is dead; there can be no manner of doubt of that," said Durand; but doubt was in his tone and in his eyes.
"Nothing is certain; it would be like Karl to turn up again with a son to back his claims.

They may both be living.