Leonardo helps the wounded Lorenzo to escape from the Pazzi, but Lorenzo is dying from loss of blood. With Verrocchio's help, Leonardo creates an improvised blood transfusion, giving his own blood to Lorenzo. While weakened during the transfusion, he has visions. While Lorenzo and Leonardo are incapacitated; so, da Vinci goes over the writings of Ibn al-Nafis to administer blood to Lorenzo.
In the meantime, Riario and the Pazzi attempt to take over Florence. Clarice and her children barricade themselves in the Medici palazzo. Zoroaster and Lucrezia attempt to commandeer the Basilisk to find the Book of Leaves, but Riario captures them and takes the ship for himself.
