As Leonardo's achievements are recognized and his reputation grows, one risky decision could destroy everything he has worked for. When an unforeseen situation further undermines his reputation as an artist, he sets his sights on the Duchy of Milan and leaves Florence.

With time running out, Stefano races to save Leonardo and finally discovers the truth behind his biggest kept secret; armed with the facts but lacking the evidence, an unexpected revelation leaves Stefano turning to an unlikely source for help.