In 11th-century Persia, a ruthless Ismaili sect is established, executing a wave of assassinations that terrorize even the mightiest rulers.
Hassan Al-Sabah, Nizam al-Mulk, and Omar Khayyam agreed to support each other if one of them came to power.
Omar Khayaam heads east to accept a royal invitation while Hassan is forced to leave west to Cairo. There, their women continue to inspire their dreams and ambitions.
Hassan pledges allegiance to Caliph Al-Mustansir Billah, but a sudden assassination tips the scales in the Fatimid Caliphate and puts him in an unexpected situation.
Lifelong friends Hassan Al-Sabbah, Nizam Al-Mulk and Omar Khayaam reunite in Isfahan. Is it time to fulfill their childhood pact?
Al-Ghazali explains the difference between Islamic sects to his students and reveals the reality of the Batiniyya groups. Sultan Malik-Shah prepares for his visit to the Abbasid Caliph to marry his daughter.
Hassan's plan to kill the Abbasid Caliph fails. Nourhan runs away on her wedding night and is kidnapped. Hassan is arrested and Abu Ali confronts him that he has betrayed the covenant and threatens to torture him and then kill him.
Donia Zad and her children try to make a getaway with the help of Zaid Ibn Sayhoun. Elsewhere, Nizam Al-Mulk sentences Hassan Al-Sabbah to death.
After his followers renew their allegiance to him, Al-Sabbah plots to seize the Alamut Castle.
Donia Zad and Hassan Al-Sabbah reunite at Alamut Castle. Later, after sending his son Al-Hussein to another castle, Hassan begins plotting the assassination of Nizam Al-Mulk.
As the siege on Alamut Castle intensifies, Al-Sabbah gathers his followers to devise a strategy to counter the attack.
Nourhan desperately looks for a way to escape from the castle as a fierce battle ignites between the Hashashin and the Seljuks.
Al-Ghazali embarks on the pilgrimage to Makkah. Al-Sabbah promises Saad paradise, assigning him a perilous mission. The King of France sends a delegation to Alamut Castle.
Omar Al-Khayaam flees Isfahan, fearing the wrath of the scholars. Elsewhere, the Hashashin march through the streets of Isfahan following Hassan Al-Sabbah’s threat to Barkiyaruq.
With the Seljuk armies united, Hassan Al-Sabbah recognises the threat Al-Ghazali poses to his mission and starts plotting his assassination. Meanwhile, Al-Hussein returns to Alamut Castle.
Omar Al-Khayaam reaches the fortress. Meanwhile, Al-Hussein is met with a shocking response from his father after targeting Nouri Zan.
Before leaving the fortress, Al-Khayaam offers Al-Sabbah one final piece of advice. Meanwhile, Barkiyaruq sets his sights on besieging Al-Sabbah's stronghold.
Hassan Al-Sabbah's life hangs in the balance. A message later reaches Barkiyaruq's army.
Barzak Omid welcomes three Seljuk soldiers and orders Hassan Al-Sabbah to keep them in the castle, despite potential repercussions.
Zaid Ibn Sayhoun meets Yahya in the presence of Al-Sabbah. Meanwhile, Donia Zad intensifies her efforts to exact vengeance on Al-Sabbah.
Al-Sabbah issues three new assassination orders. Later, the new recruits in the castle target Al-Sabbah, Barzak and Zaid.
Al-Sabbah blocks the French army’s attempt to cross the fortress without paying jizya, as he leaves Zaid Ibn Sayhoun in a tough spot with Yahya.
Donia Zad makes another attempt to end Al-Sabbah’s life. Zaid Ibn Sayhoun devises a clever tactic to buy himself more time before facing the Seljuk army.
Barkiyaruq leads an assault on the Ibn Al-Hafiz fortress. Donia Zad flees from Alamut Castle. Meanwhile, Al-Sabbah witnesses the balance of power shift between Yahya and Zaid Ibn Sayhoun.
Al-Sabbah forces Yahya to choose between two bitter choices. Later, he learns the truth about Donia Zad's escape from the fortress.
Yahya urges Barkiyaruq to appoint him as leader of the army to launch an attack on Alamut Castle. Meanwhile, for the first time, Hassan Al-Sabbah leaves the castle unescorted.
Donia Zad demands that she return to her family in Isfahan. Al-Sabbah tries to figure out what Barzak is up to. Later, Al-Hadi is named as Al-Sabbah’s successor.
Al-Sabbah warns Barzak against harming Al-Hadi, as he issues a new assassination order.
Al-Sabbah finds out that Donia Zad is inciting the people of Isfahan to riot, as his new vizier carries out his order to imprison Yahya.
Al-Sabbah reiterates his threat to Barzak to guarantee Al-Hadi’s safety, and later issues an order to take out his worst enemy.
Al-Sabbah finds himself at a crossroads.
