User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4902593-20130227080741

I have an assumption which I'd like to share:

The Seven after several adventures, succeed in closing the Doors Of Death on both sides. Nobody dies or is left behind. Percy becomes extremely skilled in combat (as he has defeated Gaia's most powerful forces). The 5 demigods (and Nico) sadly return to the US cause they could not save Percy and Annabeth (although they somehow get out later).

On the way they meet Hercules who has a vendetta against the demigods. Just then Percy and Annabeth arrive and Percy kind of defeats Hercules (because of superior skills and Hercules uses only strength). The Argo II secretly docks at Camp Half-Blood and Percy, Coach Hedge, Leo and Nico enter the battlefield (the girls, Jason and Frank have to stay away cause the Romans will tarnish their reputation further).

Percy and his friends take everyone by surprise and easily defeat the Legion. The Romans are captured and swear loyalty to Percy, while Octavian and his cronies are forced to drink a potion which will put them to sleep for months.

Meanwhile Hercules goes to Olympus and Zeus has no choice but to support the demigods to battle.

This is only my guess and no doubt Rick will write something totally different. So what do you guys think?