The tenth book in the New York Times bestselling series Villains dives into the underworld and explores how Hades went from being a god to a villain. "Ruler of the Underworld" is not the title Hades would have chosen for himself, but when he and his brothers made a deal to divide the world into three parts, Hades drew the short straw. However, eternity is a long time to be forced into a role he never wanted, and with each passing day of being treated as a villain, he grows more vengeful. The birth of his nephew Hercules, while Hades is still trapped in the underworld, pushes him to his limits. So Hades does what he does best: he makes a new deal. But when a god makes a deal with the Odd Sisters, more happens than just rewriting his own story.