User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5247339-20130622090134/@comment-120.145.82.206-20130624233338

Now that I think about it I don't think Rick will kill Percy or Annabeth as they are too important and loved by most of his fans. Although I am pretty sure two of the seven will die and that will be Hazel and Frank, as Hazel is supposed to be dead and Frank's life relys on a stick......

I mean Rick has said it before that a perfect, happy - happy ending doesn't make the book realistic, and as such I think there will be some death, bad injuries etc by the end of HoO.