Assuming a new post as district ranger at Rocky Mountain National Park in the wake of the disappearances of three young girls, Anna Pigeon is astonished when two of the girls emerge a month later with no memory of their experiences.

Recovering from recent emotional trauma, National Park Service ranger Anna Pigeon goes to New Orleans to visit her friend, Geneva, only to become the target of a dark curse, prompting her to investigate what it has to do with a fugitive mother accused of killing her family.

Anna is lodged in Yosemite National Park's historic Ahwahnee Hotel when four employees disappear. Sensing evil, Anna hikes a snowy trail to the high country, only to discover a disturbing reality that may end her adventures once and for all.

"Anna Pigeon, in her career as a National Park Service Ranger, has had to deal with all manner of crimes and misdemeanors, but cyber-bullying and stalking is a new one. The target is Elizabeth, the adopted teenage daughter of her friend Heath Jarrod. Elizabeth is driven to despair by the disgusting rumors spreading online and bullying texts. Until, one day, Heath finds her daughter Elizabeth in the midst of an unsuccessful suicide attempt. And then...

Park ranger Anna Pigeon investigates the crash of a drug-interdiction plane on an isolated Georgia island. Was it an accident or sabotage that downed the plane, killing both the pilot and his passenger? It's up to Anna and her crew to solve the mystery.