"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...

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.

Testing outdoor sporting equipment designed for a disabled companion, U.S. Park Services ranger Anna Pigeon returns from a solo outing to discover that her fellow campers have been abducted.

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.