Ruth and Harry decide to take a romantic backpacking trip through the Pacific Northwest, but amongst the beautiful scenery, Ruth makes an unexpected discovery that sets her off on a strange, frightening new path. The couple aren't alone in the woods, and they might not be the same when they come out...if they come out.
Noah is seeking to reconnect with his outcast brother after the death of their father. He hopes to make amends and share the family's fortune, but instead finds himself in a dark underworld that threatens to tear his family apart. As he struggles to maintain his sanity, Noah is led on a terrifying trail to the truth through a series of cryptic clues.
Just as Tessa's life begins to become unglued, nothing is what she thought it would be. Not her friends nor her family. The only person that she should be able to rely on is Hardin, who is furious when he discovers the massive secret that she's been keeping. Before Tessa makes the biggest decision of her life, everything changes because of revelations about her family.
Queen Poppy and Branch make a surprising discovery — there are other Troll worlds beyond their own, and their distinct differences create big clashes between these various tribes. When a mysterious threat puts all of the Trolls across the land in danger, Poppy, Branch, and their band of friends must embark on an epic quest to create harmony among the feuding Trolls to unite them against certain doom.