I asked a question like this similar to this before, I want to know if this plot is good?

It's got potential. I just got a little confused about who is gonna narrate the novel. I like the idea of the demi-god but you have to develope her incredibly well or it's not gonna work. Make sure you know infinite knowledge about basically all your characters. As I suggestion, I would say that in the prologue, You should mention the first paragraph stuff... then you should let them know that they (the reader) is going back into time (You might want to have dates on your chapters such as: Chapter One: July 1, 2003 (random date - have the year that you want). Something like that. Besides that, it's amazing. I rate it a 10 as long as you work the plot well.:)