The game follows Arbaaz Mir in Amritsar 1841, in the midst of a war between the Sikh Empire and the East India Company, two years after the events of the graphic novel Assassin's Creed: Brahman. Arbaaz must recover the famed Koh-i-Noor diamond, a powerful Piece of Eden that used to belong to the Assassin Brotherhood from a newly arrived Master Templar. While doing so, he must also protect his Mentor, Hamid, and his lover, princess Pyara Kaur.