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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: WellsEdit

Chapter 2: ClarkeEdit

Chapter 3: GlassEdit

Chapter 4: WellsEdit

Chapter 5: BellamyEdit

Chapter 6: ClarkeEdit

Chapter 7: GlassEdit

Glass Sorenson makes her way to the airvent with Luke as they leave Luke's apartment 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 Griffin was there, and she had a question for the teacher like she always does. We find out Glass wasn't particularly 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.

Chapter 8: WellsEdit

Chapter 9: ClarkeEdit

Chapter 10: BellamyEdit

Chapter 11: WellsEdit

Chapter 12: GlassEdit

Chapter 13: ClarkeEdit

Chapter 14: WellsEdit

Chapter 15: BellamyEdit

Chapter 16: WellsEdit

Chapter 17: GlassEdit

Chapter 18: ClarkeEdit

Chapter 19: BellamyEdit

Chapter 20: GlassEdit

Chapter 21: WellsEdit

Chapter 22: BellamyEdit

Chapter 23: ClarkeEdit

Chapter 24: WellsEdit

Chapter 25: BellamyEdit

Chapter 26: GlassEdit

Chapter 27: ClarkeEdit

Chapter 28: GlassEdit

Chapter 29: WellsEdit

Chapter 30: BellamyEdit

Chapter 31: ClarkeEdit