It’s been a year since Billie Flanagan went on a solo hike in Desolation Wilderness and vanished from the trail. Her husband and teenage daughter have been coping with Billie’s death the best they can: Jonathan drinks as he works on a loving memoir about his marriage; Olive grows remote, from both her father and her friends at the all-girls school she attends. But then Olive starts having strange visions of her mother, still alive. Jonathan worries about Olive’s emotional stability, until he starts unearthing secrets from Billie’s past that bring into question everything he thought he understood about his wife. Together, Olive and Jonathan embark on a quest for the truth.