When Rio Kaiser's family vacation in Yellowstone National Park turns catastrophic, they must return to the hidden world where fears come to life—fears that can kill. In a panic to save the people with her, Rio fails to harness her unusual ability to control the elements which thrusts her and her family into even more danger when they become separated.
Paired with her cousin, Tom, his attempts to help only frustrate Rio more which causes her power to work against her. If Rio cannot recover her special ability, she and her family will perish in the mysterious world of stone men and creatures that are never as harmless as they appear.