An unprecedented emergency sends Fairbanks into lockdown. Frank gathers every resource available to mount a full-scale response.

Sarah's disappearance adds urgency to Frank's search. Havlock's master plan takes an unexpected turn, increasing the number of hostages.

Luke tries to get back home as the manhunt for Havlock intensifies. Frank weighs whether he should give in to a set of demands.

A state trooper goes missing, widening Frank's investigation. Armed locals join the manhunt. Sarah grows concerned over Luke's whereabouts.

Frank focuses on tracking down Luke. The CIA's involvement ramps up as Havlock's plan enters a new phase.