This page contains a chapter by chapter summary of Day 21. We hope this summary will make it easier to find specific areas of the book, as well as providing a quick plot refresher for anyone who doesn't want to take the time to reread the entire book.
Chapter 1: Wells
Chapter 2: Clarke
Chapter 3: Glass
Chapter 4: Wells
Chapter 5: Bellamy
Chapter 6: Clarke
Chapter 7: Glass
Glass makes her way to the airvent with Luke as they leave Luke's appartment behind. They get to the airvent, and they laugh about how adventurous it all is before Luke tells her he loves her and Glass gets into the airvent. When she reaches the Phoenix vent, she finds out it has been sealed shut. Since she can not access Phoenix from inside the ship, she comes up with the plan to do it from the outside.
Flashback : Glass recalls a day during tutorial. She remembers being bored and sleepy and barely paying attention. Her friend Cora was half asleep, and they exchanged messages throughout the class. Glass mentions how Clarke was there, and she had a question for the teacher like she always does. We find out Glass wasn't particulary friends with Clarke, as she makes a mean remark about Clarke's outfit before heading home. Glass mentions she wanted to go to the Exchange, but Cora didn't have time to go and she doesn't like shopping on her own.