Other People's Money by Emile Gaboriau

It was a revelation, that visit of Mme. de Thaller's; and there was no need of very much perspicacity to guess her anxiety beneath her bursts of laughter, and to understand that it was a bargain she had come to propose. It was evident, therefore, that Marius de Tregars held within his hands the principal threads of that complicated intrigue which had just culminated in that robbery of twelve millions. But would he be able to make use of them? What were his designs, and his means of action? That is what Maxence could not in any way conjecture.

He had no time to ask questions.