As the only Scion who can descend into the Underworld, Helen Hamilton must wander Hades by night in order to stop the endless cycle of revenge that has cursed her family. Without Lucas by her side, she's pushed to a physical and emotional breaking point. Then, a mysterious new Scion comes to her rescue. Funny and undeniably gorgeous, Orion protects her from the dangers of the Underworld. But time is running out—a ruthless foe plots against them, as the ancient Greek world collides with the mortal one. But even as her life becomes a hell of chaos, the hardest part of all will be forgetting Lucas Delos.