Jason Grace is missing, kidnapped from New Rome with no one knowing how it happened. His cousin, Percy Jackson, Son of Neptune, is going crazy trying to find him. But as new threats rise, Percy finds out that not all is as it seems, and that his search for his cousin may have to wait while he handles these new threats, both internal and external. Sequel to Vas Bellicosum.

Third Book of Destinies Series. A fall into the endless abyss. A journey never taken by the heroes of old. Percy Jackson and Zoë Nightshade embark on a quest to do the impossible. A race against time through the worst place in the mythical world. Can they reach the heart of Tartarus and close the Doors of Death or will Gaea win out and turn the mortal world to ash?