The emperor Constantine prefers Sultan Murat II to be replaced by prince Orhan. In fact, it is Mehmet II's turn to be the sultan. Kara Murat and his friends get into Byzantium. Murat becomes Orhan's raider alias Kosta. Orhan's love Princess Olimpia falls in love with him. She tells him about the plot to kill Mehmet II. In the meantime Sultan Murat dies. Olimpia goes to Manisa to attract Mehmet's attention and intends to kill him after wards. Murat and his friends set off for Manisa. As Olimpia wants to pour the poison in Mehmet's drink, Murat reaches just in time and saves him. So, Olimpia has to drink the poison. While Sultan Mehmet sets off for Edirne, Murat has yet again successfully completed another mission.