The Copeland family deal with being separated. Eve is forced to make a tough decision about the truth when put in danger at the mall.

Things at the mall get tense when people want to establish rules. At the church, Natalie's faith is tested in terrifying ways.

Kevin and the others try getting away from the church and meet someone on the road. At the mall, a new rule is broken; punishment must be handed down.

Kevin's group make to the hospital in time to save Bryan. Kevin has a brutal encounter with his estranged brother, Mike.

At the hospital Kevin becomes an involuntary test subject on what is driving the mist. Meanwhile at the church, Nathalie Raven discusses her theories about the mist and has a violent encounter with one of the church parishioners.

Kevin's group finds an unlikely sanctuary in the psych ward. Tensions at the mall grow as food runs low. Nathalie and Father Romanov face off at the church.

Nathalie's influence over the remaining church parishioners continues to grow. At the mall Alex and Jay grow closer until Eve intervenes. Kevin and the group make a stop at Adrian's home where Kevin makes a shocking discovery.

Adrian arrives at the mall with somber news for Eve and Alex; meanwhile, the mall residents start to turn against them.

Tensions at the mall finally come to a head, and the group makes a discovery which could provide answers about the origins of the mist.