A California wildfire traps a bus full of high school students, including Everett and Blake, who have an encounter with something lurking in the flames; Luna and Harlan cross the fire line in a desperate search for their missing Park Ranger father.

As the full moon reaches its peak, Everett, Blake, Luna and Harlan are drawn together by an unknown force; Kristen locks into the group as suspects as Garrett tries to survive the wildfire.

Taken into questioning by Ramsey and her team, Everett, Blake, Luna and Harlan construct an alibi; Luna and Harlan make a startling discovery when they defend Everett from their first terrifying sighting of the creature.

Garret joins Ramsey's arson task force, hoping to stay ahead of the investigation and protect his children's secret. Blake tries to protect Danny from a monster encounter.

The unknown caller leads the pack to the site of an attack. To protect their friends, Everett, Blake, Luna and Harlan crash a party and the task force follows a trail to an abandoned construction site where they discover the fire's point of origin.

The party turns deadly, causing the police to arrive. Ramsey and Garrett encounter something strange in the woods and the pack visits a former firefighter, Malcolm, to get answers about the wildfire.