When the Ottoman Empire storms the city of Otranto, Leonardo and his allies are forced to retreat.

Leo devises an escape from Otranto, but it might be too late for those closest to him.

Leo's investigation of a grisly murder threatens to expose the Labyrinth

As Carlo tries to program Leo to become "one" with the Labyrinth, Leo escapes into an alternate reality that threatens both his mind and his life.

Leo's paranoia shuts him off from his friends while Lucrezia finds herself in danger as she searches for a way to make amends for past sins.

The Monster of Italy is finally captured but danger still lurks, potentially threatening the upcoming Crusade Festival.

Crusade efforts are thwarted when an old nemesis returns to Florence and stands in opposition. Vanessa and Nico question their futures, while Leo struggles to decipher the Turkish armor.

While Nico and Zo seek out support for the Crusade from an old foe, Leo is ambushed by the Labyrinth.

Leo and Sophia struggle to control the mysterious device they've built. Back in Florence, Riario awaits judgment while Lorenzo and Vanessa take their partnership to the next level.

Following the Ottoman army's ambush on Crusage forces, Leo must put his faith in his friends and in himself if they're to have a chance to defeat the Turks.