In 861 CE Baghdad, a young street thief named Basim Ibn Ishaq scrapes by in the town of Anbar alongside his closest companion, Nehal. Haunted since childhood by disturbing visions of a monstrous jinni, Basim yearns for purpose beyond petty crime and sets his sights on joining the Hidden Ones, a secretive organization operating in the shadows. When he infiltrates the Caliph's palace to prove his worth and inadvertently triggers a devastating crackdown on the thieves of Anbar, Basim is forced to flee everything he has known.

Taken under the wing of the stern Hidden One mentor Roshan, Basim trains at the mountain fortress of Alamut and eventually earns his place among their ranks. Dispatched to Baghdad to dismantle the influence of the Order of the Ancients, a powerful faction that has infiltrated the highest levels of the Caliphate, Basim hunts their members through the city's bustling districts. But as he closes in on the Order's leadership, unsettling connections between the ancient artifacts they seek and his own fractured memories begin to surface, pulling Basim toward a truth about his identity that threatens to reshape everything he believes.