Anna questions the official explanation when the death of a fellow ranger unsettles the park.

As Anna settles into a more complicated personal life in the park, she discovers a game of hide-and-seek has taken a turn; intent on helping a family in crisis, Anna and the rangers must make a decision that will affect the family's future.

Anna guides a tense group of campers through the backcountry as a fierce storm closes in.

An explosion at the park draws Anna into a case beyond its borders.