After a list with the real identities of undercover bureau operatives leaks, Brian develops a personal connection with FBI Agent Lucy Church, a tenacious rule-breaker, when he helps her finish a field case before she's exposed. Also, Sands makes a surprising move to end Rebecca's investigation into Senator Morra.

Brian and Rebecca are placed under quarantine by the CDC after being exposed to an unknown substance after investigating a citywide blackout. Also, trust issues arise after Rebecca catches Brian using his secret stash of NZT.