The Heart of Rome by F. Marion Crawford — Read

The Baroness had been called to the telephone five minutes after Volterra had gone out with the porter, leaving word that he was going to the Palazzo Conti and would be back within two hours. The message she received was from the Russian Embassy, and informed her that the dowager Princess Conti had arrived at midnight, was the guest of the Ambassador, and wished her daughter Sabina to come and see her between eleven and twelve o'clock. In trembling tones the Baroness had succeeded in saying that Sabina should obey, and had rung off the connection at once. Then, for the first time in her life, she had felt for a moment as if she were going to faint.

The facts, which were unknown to her, were simple enough. The Ambassador had been informed that a treasure had been discovered, and had telegraphed the fact in cipher to the Minister of Foreign Affairs in St. Petersburg, who had telegraphed the news to Prince Rubomirska, who had telegraphed to the Ambassador, who was his intimate friend, requesting him to receive the Princess for a few days. As the Prince and his sister were already in the country, in Poland, not far from the Austrian frontier, it had not taken her long to reach Rome. Of all this, the poor Baroness was in ignorance. The one fact stared her in the face, that the Princess had come to claim Sabina, and Sabina had disappeared.