THE SERUM WEARS off five hours later, when the sun is just beginning to set. Tobias shut me in my room for the rest of the day, checking on me every hour. This time when he comes in, I am sitting on the bed, glaring at the wall. “Thank God,” he says, pressing his forehead to the door. “I was beginning to think it would never wear off and I would have to leave you here to … smell flowers, or whatever you wanted to do while you were on that stuff.

I don't see any elderly people in the crowd. Are there any old Dauntless? Do they not last that long, or are they just sent away when they can't jump off moving trains anymore?

What's worse: to be idle while someone dies, or to be exiled and empty-handed?

'Divergent' was my utopian world. I mean, that wasn't the plan. I never even set out to write dystopian fiction, that's just what I had when I was finished. At the beginning, I was just writing about a place I found interesting and a character with a compelling story, and as I began to build the world, I realized that it was my utopia.

It will be difficult to break the habits of thinking Abnegation instilled in me, like tugging a single thread from a complex work of embroidery. But I will find new habits, new thoughts, new rules. I will become something else.

It's then that I realize: Of course Tris would go into the Weapons Lab instead of Caleb. Of course she would.

When you're a writer, you hear your internal critic, and that's really hard to get over. And then sometimes you hear critiques from classmates and stuff. But when a book comes out, it's just hundreds of opinions and you have to learn to separate out the ones you want to listen to or figure out many you want to listen to.