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An Ottoman attack on Italy seems likely. Meanwhile, Riario faces danger again and Vanessa's destiny is in Nico's hands.
While Lorenzo negotiates with King Ferrante, Leonardo returns to Florence to discover that Duke Federico rules with an iron fist. In Rome, Riario seeks redemption for his sins.
As Leonardo and Riario prepare to die, Zoroaster and Nico plan their escape. Meanwhile, Lorenzo tries to meet with the king of Naples and Bayezid visits Rome.
The search for the Book of Leaves continues, becoming ever more dangerous. Meanwhile, Lucrezia manages to intrigue the Sultan's son and Clarice receives assistance from Carlo.
Leonardo and Riario find that entering the Vault of Heaven is not as easy as they may have hoped. Meanwhile, Lorenzo becomes embroiled in Ferrante's games and Lucrezia meets the Turk.
Clarice fights to keep control of the Medici bank, whilst in Naples, Lorenzo hopes an old flame will help him save Florence. Over in the New World, Leonardo is reunited with Nico and Riario.
As Leonardo tries to cross the Atlantic, without the aid of maps, Lorenzo's makes an undercover trip to Naples. Meanwhile, Lucrezia attends a secret meeting at the Vatican.
While Pope Sixtus's sanctions against Florence forces Lorenzo to make sacrifices, Leonardo continues to search for the Book of Leaves and Lucrezia seeks out new allies in Rome.
When Pope Sixtus tries to unite powers against Florence, Leonardo must come up with a solution. Meanwhile, Riario continues to tempt Nico.
With the House of Medici weakened, the Pazzis try to seize power in Florence, leading to Leonardo making a desperate gamble. Meanwhile, Count Riario believes he is getting closer to the Book of Leaves.