Mehmed, having left the throne to his father Murad, returns to Saruhan to address local issues, including pirates obstructing trade. Solving this would fulfill the people's wishes and address a personal problem for Mehmed. The Venetians complain about Mehmed to Murad, and Çandarlı presents evidence against him, prompting Sultan Murad to summon Mehmed to account for his actions. Mehmed must either face the Sultan with Bali Beys or capture the pirate leader, Capello, to clear his name. In the harem, Mehmed's summons worries Hüma but pleases Halime. Mara plots to eliminate rivals for Mehmed by ensuring Ahmed's disappearance. The reactions of Hüma and any counter plans from Halime add to the intrigue.

Mehmed proved his innocence to Sultan Murad by capturing Capello. Murad then questioned Mehmed about the silver coins printed in his name, which Mehmed explained. With the Crusaders advancing, Mehmed proposed an Oghuz Union, which Çandarlı opposed. The council awaited Murad's decision. Following Murad's orders, Mehmed found Wallachians escaping from Janosh and planned an attack with their help. Janosh, however, also strategized against the Ottomans, leading to uncertainty about the outcome. Prince Ahmed choked on roasted chickpeas, witnessed only by Hüma and her apprentice Çeşmidil. Hüma faced a dilemma of whether to intervene or not, creating potential tension in the palace, especially with Halime. In Byzantium, Demetrios escaped a trap and became emperor, surprising Helena, Konstantinos, and Notaras. Demetrios's judgment on the attempt and the responses of the others remain to be seen.

Mehmed narrowly escapes an ambush by Janosh and faces the challenge of assisting his father, Murad, who is under attack from Wallachians with explosive pots. Murad must also defend himself against a sneaky Wallachian. Upon returning from the victorious Kosovo War, Çandarlı seeks revenge on Mehmed by setting up a scheme during Zafer Toyunda. Mehmed and Gülşah's marriage occurs with Sultan Murad's and İbrahim Han's permission, despite Mehmed's reluctance, causing concern for Bahar. In the harem, Halime Sultan manipulates Murad to send Hüma to Bursa, worsening Hüma's illness. Halime continues plotting, now focusing on Gülşah as Mehmed's wife.

On the night of his wedding, Mehmed embarks on a risky journey to Constantinople to save Zağanos, collaborating with an unexpected ally from the Byzantine palace. He also meets Urban, hoping to convince him to return. Mehmed's plans are shattered by news of his mother's death, causing him to question his father. His departure to Constantinople causes chaos in Edirne Palace, prompting İbrahim to confront Murad about Gülşah. Meanwhile, Helena and Notaras, aware of Turkish infiltrators, plan to capture Mehmed, which causes tension between Konstantinos and his mother Helena. The success of their plans and Mehmed's fate hang in the balance.

Prince Mehmed, ambushed by the poor, fights fiercely as İshak approaches with his men. Mehmed later returns to Edirne and moves his harem to Manisa, where he receives a letter to Gülşah prompting a journey to Karamanoğlu. Murad deteriorates after Hüma's death, causing concern for Çandarlı, who contemplates measures for the state's future. Mehmed, aware of the situation, leaves Şehabeddin in Edirne. In Byzantium, tensions between Konstantinos and Helena intensify as Konstantinos prepares to make significant changes, with Helena and Notaras posing major obstacles.

Following Sultan Murad's unexpected death, the Ottoman palace mourns and a new era begins. The question arises: will Mehmed or Orhan ascend to the throne? Despite İshak's opposition, Çandarlı supports Mehmed's succession, fearing unfortunate consequences. Mehmed, cautious of potential plots, sets out carefully with his servants. Constantine plans to hinder Mehmed, favoring Orhan's ascension. Orhan, closer to Edirne and with a better chance at the throne, rejects Konstantinos' offer for help, knowing it would not be welcomed. He faces an unexpected obstacle, Bali Bey, whose intentions remain unclear.

After ascending to the throne, Mehmed confronts Halime for attempting to kidnap Ahmed and Çandarlı for his alleged complicity. Halime faces a choice: implicate Çandarlı or remain silent. Mehmed establishes a new order in the palace and must decide on the Grand Vizier. In the harem, Bahar becomes the chief haseki, marking a new era. Hala Sultan's unexpected arrival disrupts the harem's order, and her first move targets Halime. Gülşah is placed under Bahar's influence by Mehmed. Çandarlı plans a new strategy against Mehmed, using Piri Pasha's arrival to pit the Ottomans against Karaman. The unfolding events set the stage for further political intrigue and power struggles.

While campaigning against Karaman, Mehmed invites Evrenesoğlu Ali to handle potential issues in the capital, appointing him as the palace trustee. Çandarlı, remaining in the capital, plots to place Ahmed on the throne by manipulating Gülşah, facing obstacles from Halime who also aims to make Ahmed sultan. Konstantinos makes a risky offer to increase Orhan's allocation to quell discontent about Orhan's expenses, awaiting Mehmed's response. Kurtçu, following Çandarlı's orders, plans to intercept Mehmed and challenge him to pass under swords, risking conflict with the Janissaries. The unfolding events create a tense atmosphere, with Mehmed's decisions and responses critically shaping the outcomes.

After Prince Ahmed's death and Kurtçu Doğan's execution of Mehmed, Mehmed declares a new era, removing Kurtçu Doğan from Ocak Ağa and punishing the rebels. He reaffirms his goal of conquering Constantinople. Constantine, having exiled Notaras and brought in Sfrancis, tests Mehmed's stance on peace by sending an ambassador again. Meanwhile, Helena plans to marry off Constantine, seeking a suitable wife. In the harem, Halime's time ends as she passes away following Ahmed's death. Gülşah intercepts a letter sent to Mihriban, adding intrigue regarding Hala Sultan's involvement.

Mehmed, having executed the Byzantine ambassador, announces his goal and demands immediate preparations, instructing Urban to expedite his work. He sends Zağanos Pasha to implement a justice revolution and prepare for conquest, but Zağanos returns unsuccessful. Determined, Mehmed plans to personally convince Hızır Çelebi. Gülşah suspects Mihriban of betrayal and informs Hala Sultan. Hala Sultan must convince Gülşah, while Mara, mistrusting Hala Sultan, pursues her, leading to a confrontation. Konstantinos seeks to halt the fortress construction, with Sfrancis suggesting a raid involving Orhan. The Balinese working on the fortress face potential attacks, raising questions about their ability to resist.

A cannon explodes near Mehmed, turning the area into chaos. Quickly removed, Mehmed faces more disappointments, including a fortress raid and Mara's kidnapping, pushing him to demand accountability from the betrayer and the careless. Konstantinos, having kidnapped Mara, tries to convince her to marry him, but Mara stands firm. The outcome of this struggle remains uncertain. Orhan seeks revenge on Bali, whose fate is in question. Hala Sultan, having created space by removing Mara from the harem, has new goals. It is uncertain whether Bahar and Gülşah will counter her moves or if Hala Sultan will dominate the harem.

Constantine reveals the truth to Mehmed when handing over Mara, exposing Çandarlı Halil's collaboration. Mara must decide whether to inform Mehmed or confront Çandarlı herself. Tired of political games, Mehmed sets his sights on conquering Dimitria Castle. Mara's return causes concern for Hala Sultan, prompting her to warn Mihriban. Mara devises a dangerous plan to expose Hala Sultan. The outcome of this scheme remains uncertain. Constantine seeks to bolster his city's security and considers seeking help from the Vatican, despite opposition from Helena and Sfrancis. The success of this unity and Constantine's plans hinge on overcoming these internal disagreements.

The Ottoman army, led by Zaganos, faced resistance at Dimitria Castle. When hope seemed lost, Sultan Mehmed arrived, inspired his soldiers, and ordered a final attack, aiming for victory. Meanwhile, the Hurufis, taking over provisions and spreading propaganda in the capital, face a new challenge as Mehmed is determined to protect his state from corrupt beliefs. Mara, seeking to undermine Byzantium through Hala Sultan, gains Mehmed's permission for her plan. Konstantinos, upon learning from his mother Helena why the castle was lost, plans to issue a harsh punishment to set an example.

After conquering Dimitria Castle and defeating the Hurufi plague, Mehmed sets his sights on Constantinople. He tasks Evrenosoğlu with eliminating Orhan, aiming to trap him with a plan involving Hala Sultan. Meanwhile, Konstantinos, seeking to recover from his defeat, sends Sfrancis to attack the dervishes, hoping to prove the Turks cannot establish themselves. This draws the Ottomans towards him, and Çandarlı marches to confront Sfrancis. In the harem, Halime plans to kidnap Hala Sultan, who is awaiting her fate. The outcome of this plot remains uncertain.