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.
Leo Cartwright's retirement plan doesn't go exactly to plan - not when he meets Christopher Tate after his very last show. Christopher has a secret to share, one that he entrusts with his favourite comedian. When Christopher ends up dead soon thereafter, what's Leo to do but act on the information he's been given, even if it's completely insane? Setting out to find the mysterious town named Elswich, Leo can't deny there's something off about the entire thing. For one thing, the community of the town doesn't seem normal.
US Marshal Virgil Bone finds himself amongst the Isle's isolated community - a community that shares a horrific past that still taints their daily life. Mistrusted and clearly unwelcome from the onset, Bone struggles to do his job, which was supposed to be the simple collection of a fugitive's dead body. Now he's stranded, surrounded by secrets and a rising death toll. If only he wasn't met with aggression, then maybe he could help save lives.