Joe Crawford never would have expected to witness a mother abusing her infant, but making a stop at a gas station forces Joe to make a decision - to involve himself or let it be. Being a family man himself, he can't bear the sight, yet saving Little Stevie from abuse results in terrible repercussions. Now a group of people have Joe in their sights, and they blame him for losing one of their own. They'll stop at nothing to succeed in their revenge, even endangering Joe's own daughter.
The Algonquin Falls grand opening proves deadly when creatures of myth emerge from below and begin slaughtering every man, woman and child. Trying to avoid being killed and eaten, Jesse and his group have no choice but to enter the expansive cave system under their feet and search for alternate means to escape the state park. Soon they meet up with Charly and her band of survivors that are on a rescue mission, and together they join forces where not only are they outnumbered, but something much larger, more powerful, is also on their trail.