While Osman Bey was reckoning with Vizier Alemşah, Geyhatu was at the door! Before this battle that will bloody Söğüt, Kayı Obası and Sheikh Edebalı’s lodge are besieged by the Mongols. What will Osman Bey do to break this siege? Having learned that Osman Bey is now facing Geyhatu, Gündüz Bey embarks on an irreversible path. While Geyhatu has mobilized all his means to eliminate Osman Bey, he plans to eliminate the Tekfurs in order to become the sole dominant power in Bithynia. How will Osman Bey protect Söğüt from Geyhatu and Mongols? What attitude will Gündüz Bey take in the face of Geyhatu’s move? Will Osman Bey punish Tekfur Nikola? Will Kayı Obası be able to escape from the siege on him?