Down, Up and Around (Rewrite)

[This is a rewrite of my other story, also named Down up and around.]

Patroclus is dead, and this he knows for a fact. So he is rather surprised when he wakes up to find himself in a world two thousand years in the future, in a camp for demigod kids. Little does he know his true love follows soon behind. When the oracle delivers a prophecy, ordering a quest, how will the old work with the new, and how can Patroclus and Achilles go back to where they belong, in the underworld?