Such a leader as Carlo Zeno might indeed have successfully besieged Andronicus in his palace; but he knew, and every man and woman in Constantinople knew well enough, that Andronicus would make an end of his father and of his two younger brothers in prison, at the first sign of a revolution, so that there might be no lawful heir to the throne left alive but he himself. Therefore it was the first and the chief object of the patriots to bring Johannes secretly from his place of confinement to the heart of the city, or to one of the islands, beyond the reach of danger, till the revolution should be over and his son a prisoner in his stead; though it was much more probable that the latter would be summarily put to death as a traitor. All this Zeno had understood before Zoë had spoken to him about it; but he had not known that the Genoese had demanded Tenedos of Andronicus as the price of their protection against the Turks; for the negotiations had been kept very secret, and at first Carlo had not believed the girl, and had deemed that the tale might be a pure invention. He had come again to see her on the following day, and again he had vainly tried to find out who she was, and in what great Fanariote house she had been brought up. It was impossible to get a word from her on this subject; and she warned him that what she had told him must not be repeated in the hearing of any Genoese, nor of any one connected with the Court. The Genoese meant that no one should know of the treaty till it was carried out, and until Tenedos was theirs; for the place was very strong, as they afterwards found by experience, and Andronicus needed their help too much to risk losing their favour by an indiscretion. These injunctions of silence made Carlo still more doubtful as to the veracity of Zoë's story, and he frankly told her so and demanded proof; but she only answered as she had at first. 'If it is not true,' she said, 'brand me in the forehead, as they brand thieves, and sell me in the open market.' And again he was angry, and swore that he would do so by her indeed if the story was a lie; but she smiled confidently, and nodded her assent. 'If you do not save the Emperor,' she said, 'you Venetians will be driven out of Constantinople before many months; and if Genoa once holds Tenedos how shall you ever again sail up the Dardanelles?' Many a time she had heard Michael Rhangabé say as much to his friends, and she knew that it was wisdom. So did Zeno, and he wondered at the knowledge of his bought slave. So he came and went, turning over the great question in his brain; and she awaited his coming gladly, because she saw that he was roused, and because the longing for just revenge was uppermost in her thoughts. Thus were the two drawn together more and more, fate helping. Yet he told her nothing of the steps he took so quickly after he had once made up his mind to act.