Son Kale Hacibey is a historical action film that tells the story of a battle between the Turkish Ottoman Empire and the Ukrainian Hetmanate Empire on the one hand, and the Russian Empire on the other hand. The forces are fighting to gain control of the Hacibey Castle, an impenetrable fortress located on the Black Sea coast in the heart of Ukrainian Hetmanate Empire. And just when the Russians thought they were winning the battle against Ukrainians and Turks, a mysterious hero - a brave Ukrainian cossack warrior Andriy - arrives in Istambul to deliver a secret message from from Ukrainian Hetmanate Empire's leadership. A message that can forever change the course of this battle.