When a human foot is ejected from a geyser in Yellowstone National Park, Special Agent Emme Helliwell of the National Park Service is assigned the chilling case. Tasked with identifying the victim and uncovering what led to such a grisly end, Emme is drawn into the park’s vast, unforgiving wilderness --- and into the orbit of a private school for at-risk teens where extreme backcountry excursions are part of the curriculum. As disturbing truths begin to surface, Emme must also confront personal fault lines, including the unresolved tension with an ex-boyfriend who’s suddenly back in her life and assigned to the same case. In a place where danger hides behind natural beauty and good intentions can mask darker motives, Emme must navigate both treacherous terrain and emotional landmines to solve a mystery that could cost her everything.

Grief-stricken over her mother’s death and bruised by her failure on her most recent case, Special Agent Emmeline Helliwell with the National Park Service returns to her Utah hometown to heal and regroup. She’s determined to turn in her badge and take over her mother’s bakery for a much quieter life…until the body of a childhood friend turns up in The Narrows of Zion National Park. The case is too personal for Emme to turn down, but the seemingly simple investigation turns treacherous as clues that connect to her previous case grow too glaring to ignore. When bodies start to pile up, Emme must track down the killer before they take more lives, venturing deep into Zion National Park to uncover the sordid secrets hiding beneath its stunning beauty.