Thank you all for your thoughts! All of them where helpful, although I haven't decided yet.
Let me answer you individually
IKEA, I haven't had the chance to listen to the podcast yet, but hope to do so before going to bed.
Róisín, I know that you are right, of course, but a prologue spanning 10 years? I hope to not produce a second Wheel of Time. If I do, please kill me. (Sorry to all fans!)
Jethan, his life has never actually been that great, even when he was with his family, so his first captivity was almost enjoyable to him, because it gave him a purpose of sorts, and he met other children of his age.
Otherwise your advice is really helpful.
At the moment it looks like the story might span two books, although I could easily make it four shorter ones. I don't think a trilogy would work (the middle book often feels like a filler, anyway).
I thought I might try writing it form when he is 12, which is what I had planned originally (like four years ago, before I even knew there would be a second part).
Maybe I could try to have a proper, long chapter or several chapters in a row that deal with current developments, then have a short interlude in the form of a dream, a memory, a letter, that shows his past? And jump in time after each of them? Hmmm.
Might also be a bit difficult to make that seem natural... Hm. I could include a little bit of his first captivity: there is a delegation coming to get him from there anyway. It means I can use a scene I wrote almost seven years ago. With heavy modification. Which is better than not at all.
...
That
would be nice.
I'll think about it some more!
And try draw up a chapter plan, rather than just a plan of the whole plot, which is what I have done so far. Maybe mark the 'nothing happens' places in and try to figure out which complementary memories could take their place...
Any other ideas?
Do you usually write plans for chapters? And what information do you use to draw up these plans?