Ravenna's Italian guile had been more than a match for Zabern's subtlety. His object in kneeling before the altar had not been to pray, but to release the dove which had been attached to it by a silken thread--a dove purposely kept for emergencies. What captain of the guard on arresting the archbishop would be so stern-natured as to refuse his prisoner a few minutes' prayer in his private oratory? Ravenna, on releasing the dove, had affixed the letter to its neck, performing the feat so guardedly, that though he had been watched, now by Zabern, and now by Nikita, his movements had not given rise to suspicion. "Listen," cried Ravenna, raising his left hand warningly. "If you enter I quit my hold of the dove. You observe the letter. Let me tell you what it contains." "Say on," returned Zabern with affected indifference. "Your ten minutes have not yet expired." "This evening," began the cardinal, "and just prior to your arrival I penned a letter intended for the Czar's perusal. That letter now hangs from this dove's neck. It contains three statements. Firstly, that the Princess of Czernova is not Natalie Lilieska; secondly, that the Czernovese Charter is a forgery from the hand of Katina Ludovska; thirdly, that the Convent of the Transfiguration contains ample evidence of a conspiracy for the emancipation of Poland. Each of these facts, singly, if known to the Czar, would be sufficient to hurl the princess from her throne. If this dove should fly forth it would be in my nephew's house at Zamoska within thirty minutes; an hour more, and Redwitz would be in the camp of the Czar. Thus, then, do I make my terms. Approach to do me hurt, and I release the dove. Retire from the palace, give me my life, and I swear by all that I hold holy to refrain from endangering the throne of the princess. It is within your power to murder me, but the murder will be dearly purchased, for it will bring utter ruin upon Czernova." "Idle vaunting!" said Zabern. "All know that the carrier-pigeon flieth not in the dark." "This dove has ere now found its way to Zamoska by moonlight." That the cardinal spoke truth when he declared that the letter contained the weighty secrets Zabern did not doubt. Therefore to advance with intent to slay would be fatal to the interests of the princess; and yet to retire, leaving Ravenna to his own devices would be equally fatal, for Zabern knew full well that the cardinal's most solemn oath was not to be trusted. So soon as the trio should withdraw, so soon as Ravenna should be released from the fear of their presence, he would laugh at their simplicity, and would carry out his evil work against the princess, ay, and with more determination than ever, embittered as he would be by the attempt made upon his life. It was a terrible dilemma.