immediately to put him under surveillance.

The Duke (aside)
This man seems more honest and reliable than the other.

Vautrin
We put the secret police on such cases.

The Duke
You ought not to have come here, sir, unless you were able to justify
your assertions.

Vautrin
I have done my duty. I hope that the ambition of this man, who is
capable of selling himself to the highest bidder, may be of service to
you.

The Duke (aside)
How can he have learned so promptly the secret of my morning
interview?

Vautrin (aside)
He hesitates; Joseph is right, some important secret is at stake.

The Duke
Sir!

Vautrin
Your grace!