After Tobias stomps out of the lab, Tris doesn't follow him.
Tris thinks Tobias is the same person. She doesn't see him any differently because some people think he's damaged.
Tris is immediately jealous of Nita for daring to talk to Tobias when she isn't around.
Zoe pops up and says they've scheduled a plane flight to leave in two hours.
After a snow delay, Tris flies on the plane and ends up experiencing a 36-hour layover in Atlanta…
Okay, not really. Tris and her friends (sans Tobias) go up in the plane and are amazed at how big the world really is.
That evening, Tris cracks open her mom's journal. Her past is pretty horrific: she killed a man and got snatched by a guy in a van. The guy tested her genes, which were high-quality denim, and took her to the Bureau because she was so genetically perfect. Nothing comes between Tris's mom and her Calvin Klein genes.
Tris talks to Christina about these revelations, and they wonder if they'll ever be able to call the Bureau "home."
We learn that home is not were Tris's brother is. He walks in, and Tris leaves the room without talking to him or even making eye contact.