Beneath the Ruins, Hades' agent, the Nether Owl, is using soul-corroding power to devour the vitality of mortals and prepare for the Lord of the Underworld's arrival. Yu Fan, who can see the cracks in the Ruins, and Yu Hao, who wields lightning abilities, become unexpected variables in this conspiracy. One hides in the shadows to unravel the Nether Owl's plans; the other faces him head-on. As the Nether Owl's double prongs thrust toward Yu Hao's vitals and Hades' shadow appears in the sky, the two boys' resistance will kindle the first spark of war in the mortal struggle against the gods.
