An attack at the sacred city of Alamut is planned by Dastan (Jake Gyllenhaal), an orphan in the Persian Empire adopted by king Sharaman (Ronald Pickup), his royal-blooded foster brothers, Tus (Richard Coyle) and Garsiv (Toby Kebbell), and his uncle, Nizam (Ben Kingsley), after Alamut is believed to be selling weapons to Persia's enemies. Dastan leads a surprise attack to open the city's gates to allow the army in; during the ensuing battle, Dastan comes into possession of a unique dagger. Alamut's princess, Tamina (Gemma Arterton), is arrested and agrees to marry Tus in order to achieve peace after noticing Dastan's dagger.
Dastan unknowingly presents a poisoned robe, given to him by Tus, to his father, who dies upon donning it. After
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But that night, the Hassansin leader, Zolm (Gísli Örn Garðarsson) attacks the group with vipers, which are killed by Dastan through usage of the dagger. Amar decides to go along with Dastan and Tamina to a secret sanctuary near India. However, they run into Garsiv's men. Dastan manages to persuade his brother that he is innocent, only for Garsiv to be fatally wounded by a Hassansin. The Hassansins attack, while Dastan and Tamina sneak away to the secret cave where they can hide the Dagger. After Dastan prevents Tamina from giving up her life to protect the Dagger, they are found and Zolm manages to snatch the Dagger of Time from Tamina. However, Dastan is saved from the last Hassansin by Garsiv, who then dies of his wounds.
The group returns to Alamut to reveal the truth about Nizam and the Dagger to Tus. Seso manages to take back the Dagger after a battle with Setam, the Hassansin who killed Garsiv, that ends up killing both men. Dastan confronts Tus and explains the dagger's mechanics to him and then stabs the dagger into his heart, killing himself; Tus brings Dastan back to life by rewinding time and realizes his brother has been innocent all along. Soon after, however, Nizam appears, kills Tus amd takes the Dagger, leaving an Hassansin, Ghazab, to kill Dastan. Tamina arrives to help Dastan defeat Ghazab as Nizam goes to the Sandglass caves beneath