The world around Tris bursts into flames as she finds herself unable to move. She can’t see anything beyond the smoke, but Ember is somewhere on the other side calling for her.

“Mama,” the little dragon cries, fear and panic in her voice.

Tris tries to call out to her, but her mouth won’t form any words. She’s choking; the smoke is thicker than any fog she’s ever seen.

“Mama,” Ember screams again.

Tris shoots up in the ...