Da Vinci and Verrocchio decipher the brazen head's hidden message but at a terrible cost. Riario's redemption doesn't go according to plan and neither do Lorenzo's negotiations with the King.
This week on Da Vinci's Demons, Leonardo faced one last mystery in the New World before heading home. King Ferrante of Naples finally meets with Lorenzo, but is it too little too late?
Leonardo and his allies enter The Vault of Heaven but in order to reach The Book of Leaves they must survive three deadly challenges. Elsewhere, Lucrezia meets with the heir to the Ottoman throne.
On Da Vinci's Demons, Leonardo uses the stars and his genius to plot a course to the new world. Lucrezia is reunited with her father and Lorenzo's road trip to Naples is interrupted.
On Da Vinci's Demons, Leonardo builds a submarine for two. Lorenzo plans to travel to Naples seeking an alliance as Pope Sixtus has excommunicated Florence.
On Da Vinci's Demons, Leonardo invents a crude amplification system. Lorenzo's speech restores order in Florence and the Pazzi traitors pay for their crimes.
On Da Vinci's Demons, Leonardo saves Lorenzo's life by performing a primitive blood transfusion. Meanwhile, Count Riario obsesses over the Book of Leaves.