Medea and Aegeus work to persuade Hero to solve the riddle of the Lexicon in hopes that he'll use his power to save Athens. However, Hero's skeptical of their true intentions and unsure of the course of action he should take.

King Minos invades Athens with the intent of killing the royal family, but instead strikes a bargain with Hero to spare their lives in exchange for the Lexicon. Meanwhile, Hero devises a bold plan that will either set him on the road to Olympus, or lead to the demise of everyone he holds dear.