Nico Di Angelo is more than used to the Demigod lifestyle. He was the son of Hades - nothing came easily.
Gruesome monsters appearing at every turn? Easy. Another quest? Predictable. So, Nico is hardly surprised when he is berated with vivid nightmares and a tortured voice, especially when he suspects it is being sent from the underworld by his old friend, Bob the Titan.
Now that a prophecy has been sent his way and the nightmares are getting worse, Nico has no doubt about it - he must go deep into Tartarus and rescue Bob.
Nico’s boyfriend Will Solace, son of Apollo, does not want to see him go alone. But Nico doesn’t even know if Will can survive a place as dark and horrendous as Tartarus, the farthest place from the sun.