The Clique of Gold by Emile Gaboriau

During the last visits which Daniel had paid to Henrietta, he had not concealed from her the fact that Maxime de Brevan had formerly been quite intimate with Sarah Brandon and her friends. But still, in explaining his reasons for trying to renew these relations, M. de Brevan had acted with his usual diplomacy.

But for this, she might have conceived some vague suspicions when she saw him, soon after he had left her, enter into a long conversation with the countess, then speak with Sir Thorn, and finally chat most confidentially with austere Mrs. Brian. But now, if she noticed it all, she was not surprised. Her mind was, in fact, thousands of miles away. She thought only of that letter which she had in her pocket, and which was burning her fingers, so to say. She could think of nothing else.