At Quantico, the Class of '09 must complete the impossible challenges of Hogan's Alley. In the present, Poet, pursuing a deadly serial killer, is helped by an old friend. In the future, tragedy strikes and the justice system is no longer under human control.

Tayo seizes control of the Bureau and makes the radical reforms he always dreamed of; the class reunites in a final showdown with the system they created; the trainees graduate, wondering where they will all end up.