Kate Winters was granted immortality. But if she wants to live in the Underworld with Henry, she needs to fight for this right. However, being immortal is not so easy. Even though Kate is destined to become Queen of the Underworld, she is more alone than ever. And despite her growing love for Henry, Lord of the Underworld, he becomes increasingly distant and withdrawn. And when Kate's coronation takes place, Henry is kidnapped by the only person who can kill him - the King of the Titans. While the other gods are preparing for a war in which they may find their end, only Kate can save Henry from the depths of the Underworld. But in order to understand the countless caves of the Underworld, Kate needs the help of the man who poses the greatest threat to her future. She needs the help of Henry's first wife. Persephone.