With Fire and Sword by Henryk Sienkiewicz — Read

After the nine days' march of which Mashkevich was the Xenophon, and the three days' passage of the Desna, the army reached Chernigoff at last. Skshetuski entered first of all with the Wallachians. The prince ordered him to the place on purpose, so that he might inquire sooner about the princess and Zagloba. But here, as in Lubni, neither in the town nor the castle did he hear anything of them. They had vanished somewhere without a trace, like a stone in the water, and the knight himself knew not what to think. Where could they have hidden themselves? Certainly not in Moscow, nor in the Crimea, nor in the Saitch. There remained only one hypothesis, that they had crossed the Dnieper; but in such an event they would find themselves at once in the midst of the storm. On that side there were slaughter and swarms of drunken peasants, Zaporojians, and Tartars, from whom not even a disguise would protect Helena; for those wild Pagans were glad to take boys captive, for whom they found a great demand in the markets of Stamboul. A terrible suspicion entered Skshetuski's head -- that possibly Zagloba had taken her to that side on purpose to sell her to Tugai Bey, who might pay him more liberally than Bogun; and this thought drove him to the very verge of madness. But Podbipienta, who had known Zagloba longer than Skshetuski, quieted him considerably in this respect.

"My dear brother," said he, "cast that thought out of your head! That noble has done nothing of the sort. The Kurtsevichi had treasures enough, which Bogun would have been willing to give him. Had he wished to ruin the girl, he would not have exposed his life, and he would have made his fortune."