The sons of the conqueror of Lesbos; Ishak, Oruç, Hizir, and Ilyas, were separated after the death of their father. Oruc and Ilyas sailed to the seas despite the opposition of their elder brother. Ishak is very happy that his brother is in his hometown, but Hizir also has in mind the great and sacred "secret" that he pursued. However, they are not the only seekers of this sacred secret.

Hizir has to get rid of Pietro's men. He embarks on a very difficult journey with Zeynep, whose life is in danger because of him. He has to deliver the trust he has in him to Master Süleyman. Pietro, who learned the situation, try to find ways to reach both the trust and Hizir. Oruc and Ilyas are very surprised when they learn who is at the head of the trap set for them. They will again find themselves in a conflict.

Ishak, who buried his enemies in the deep and dark waters of the sea; Despite all the insistence of Oruc and Ilyas, he chooses to return to his home. But the effect of the incident he lived in is still on him and a big confrontation awaits him in Lesbos.

Radko, on Pietro's orders, goes after the book that contains great secrets. He raids Ishak's house, following Suleyman in Lesbos. Will Hizir and Ishak, who suddenly find Radko in front of them, be able to get rid of this pressure?

Baba Oruç and Isabel join forces and take action to end the persecution of Unita, an organization that does not let Muslims in.

While Baba Oruç and his crew were saving the persecuted villagers and sailing again, they were attacked by Antuan, who returned to the seas under the name Black Pirate. Will Baba Oruç and the levents be able to survive this attack?

The inability to hear from Baba Oruç spread rapidly in Alexandria. Upon the news, Kılıç Bey supported Hızır Reis and Niko to find Baba Oruç and his levents; Şahin Bey and his crew had set sail in the seas to find a trace of Baba fasting and his levents.

Antuan, Radko, and his men surrounded Baba Oruc and his men who were about to leave Kalymnos. Will Baba Oruc and his men break this hoop? What traps await them as they try to get out of Kalymnos? Will Hizir Reis and Niko, who were trapped by Pietro at the same time, be able to get out of the castle?