Osman Bey’s fearless move Osman Bey and Alps embark on a deadly operation in Bilecik Castle, which they have secretly entered. Turgut Bey, who managed to reach Tekfur Rotagus and that Osman Bey allowed him to infiltrate the castle, is in the grip of a great danger. Nikola wants to marry Mari Tekfurlar, who are planning to seize Söğüt by using Priest Gregor, are preparing to strike a new blow against Osman Bey. Tekfur Nikola’s announcement that he wants to marry Mari Kosses causes confusion. Osman Bey wants to defeat the Tekfurs on the battlefield by making a clever plan in order to save the Turkmen children who were kidnapped and forced to convert. How will Osman Bey get out of the castle? How will Osman Bey and his alps get out of Bilecik Castle? What will be the results of the cooperation of Tekfurs with Father Gregor? What is Osman Bey’s move that will surprise everyone to save the captive children? How will Mari Kosses react when Tekfur Nikola wants to marry her? What will be the fate of the traitors in Kayı Obası?