User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-7594114-20130802142517/@comment-3146930-20130802212805

A plot twist doesn't make something good, no matter how surprising the twist is; M Night Shyamalan could tell you that. Killing them off would make people upset of course, but not in a good way. I mean for example, lets say that he does kill them off in Book 4, and really kills them. Of course you would be excited for Book 5 because you now have to see how he will bring them back...but he doesn't. From then on every time you re-read PJO or HoO, you will already know that they just end up dying, making it seem like a hollow ending.

Like I said, twist endings and cliff-hangers are fine and can make a story really good, but only if done the right way. There is a reason that characters like Katniss Everdeen or Goku never truly stay dead, because even if the author gave them the best death, the fans will still hate you for it.