The sun and the star (engelsk)

Nico di Angelo is pretty familiar with the realms of death, being the son of Hades and all. So when a desperate voice starts plaguing his dreams, Nico is convinced it's coming from the Underworld and belongs to an old friend - a reformed Titan called Bob. Then an ominous prophecy leaves Nico in no doubt - Bob needs his help and Nico must rescue him.