Three months after the battle of Zabor, the five friends that came together to defeat her have been separated. Burdened with the Calamity Stone she acquired in Scion of the Fox, Roan has gone to Scotland to retrace her grandmother's steps in an attempt to stop further evil from entering the world. Meanwhile, a wicked monster called Seela has risen from the ashy Bloodlands and is wreaking havoc on the world while children in Edinburgh are afflicted by a strange plague; Eli travels to Seoul to face judgment and is nearly murdered; Natti endures a taxing journey with two polar bears; Phae tries desperately to obtain the key to the Underworld; and Barton joins a Family-wide coalition as the last defense against an enemy that will stop at nothing to undo Ancient's influence on Earth - before there is no longer an Earth to fight for. Darkness, death, and the ancient powers that shape the world will collide as our heroes discover that some children collapse under their dark inheritance, and those who don't are haunted by blood.