Chapter 7: The Digital Siege
Elena, Sloane, and Maya team up. They realize the school's central server contains the "Life Logs"—digital blackmail on every powerful person in the country. They plan a heist to download the data and expose the school before the semester ends.
Chapter 8: The Betrayal
As they break into the server room, one of the group members turns on them. (Is it Liam? Is it Bea?) Elena is captured and brought before Dr. Thorne, who offers her a choice: Join the faculty as a "Fixer" or become the next "Sacrifice."
Chapter 9: The Commencement
The climax. It's Graduation Day. The ceremony is a mask for the final "trade." Elena must use the information she stole to blackmail the Board of Trustees into letting her and her friends walk away alive.
Chapter 10: The Alumna
Months later. Elena is far away, living under a new name. She opens a book in a coffee shop and finds a familiar note in the margin. The cycle hasn't stopped; it has just moved to a different campus.
Plot Device: The "Contact Book"
In your novel, you can use the Contact Book as a physical object that Elena carries. Each chapter could start with a "Contact Entry" that gives a hint about the danger to come.