User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-10750309-20130923065322

So yeah in the trailer i saw here, three battling demigods. and a fatal decision? maybe they will have to decide who will close the door. It may be Nico battling with them. So he may be the one to close. But what if Nico isn't with them but one of the seven. I'm thinking it will be either Leo or Jason. But who knows. Riordan never fails to surprise us.

I have a question. Do you think Riordan will suprise us by killing one of the seven and adding someone to the crew in replace despite introducing the seven in the first three books? If not, then the only option is Nico.