Realizing that the Ottoman spies were digging a secret passage underground in Kalymnos, Hızır and Piri Reis planned to start the conquest with this secret passage, which they would dig under the castle, together with Baba Oruç. But Pietro, who learned this plan from the spy Martin, who had infiltrated the Ottoman headquarters, managed to detonate the place where Piri Reis, Hızır, Niko and their levents were, with the bombs he placed in the passage. Will Oruç Reis be able to save his brother Hızır and his levents? Will Messiah Pasha kill Oruç Reis, whom he threatens to take his head if he fails? Will Oruç Reis be able to catch Martin, the spy in them? What will Isabel do when she finds out that her brother is a spy? Meryem understood that her brother Pietro had deceived her and stabbed Khidr. Will Meryem, whose consciousness continues to be poisoned, will be able to get rid of the castle? Will Piri Reis be able to avenge Salvator, who killed the Ottoman spies? Will Oruç Reis and his levents be able to conquer Kalymnos despite all the difficulties?