Pars Era, the year 320—war is on the horizon. As the soldiers of Pars prepare for battle, a traitor within their ranks turns the tides in favor of the enemy kingdom, Lusitania. Arslan, the young Prince of Pars, survives the massacre to discover that his father has gone missing and his life is in grave danger. Unsure who to trust, Arslan escapes the battlefield, evading capture until he’s found by his loyal friend Daryun, the formidable Black Knight of Pars.

Arslan and his troops counter an invasion in Peshawar while Etoile guides refugees to Ecbatana. But when a royal relative makes a surprising appearance, Arslan is banished until he can build an army of fifty thousand soldiers. Only his closest companions join him on this impossible task that leads to the port city of Gilan, where a pesky pirate invasion turns out to be the least of their worries.