6Chapter 5 — The Cost
17Chapter 16 — Gareth's Maps
7Chapter 6 — The Suspects
18Chapter 17 — The Interview
8Chapter 7 — The Echo
19Chapter 18 — The Vent Shaft
9Chapter 8 — What Fear Was
20Chapter 19 — The Confession
10Chapter 9 — The Notebook
21Chapter 20 — The Empty Shelf
11Chapter 10 — Priya's Secret