Park ranger Anna Pigeon and her companions discover a slain firefighter in a Northern California park, sending them on a search for a murderer in the midst of a winter firestorm.

Hoping the adventure of a raft trip in Big Bend National Park will lift her spirits, Paul takes Anna to southwest Texas. Instead of the soul-soothing experience they'd longed for, the couple finds a pregnant woman--more dead than alive--and soon they are sucked into a labyrinth of intrigue that leads from the Mexican desert to the steps of the Governor's Mansion in Austin.

It's fall in the Sierra Mountains, and Anna Pigeon is slinging hash in Yosemite National Park's historic Ahwahnee Hotel. Four young people, all seasonal park employees, have disapeared, and two weeks of work by crack search and rescue teams have failed to turn up a clue.

After a summer fighting wildfire, park ranger Anna Pigeon is enjoying a weekend away camping in Minnesota's National Park with her girlfriends. Leah Hendricks is the genius behind a high-end sports gear manufacturer and Heath Jarrod has volunteered to test out some of the equipment. But when they encounter a band of violent kidnappers little do they realise that their ultimate challenge will be to stay alive. Anna Pigeon, a ranger for the U.S. Park...

In 1995 Anna takes a job as a seasonal employee of the Glen Canyon National Recreational Area. On her day off she goes hiking into the park never to return. Her co-workers think she's simply moved on. But Anna wakes up at the bottom of a dry well, without clear memory of how she found herself in this situation. As she pieces together her memory, it becomes clear that someone has trapped her there, and no one knows that she is missing. Anna must muster...

Anna Pigeon battles her fear of confined spaces as she attempts to rescue a fellow ranger who's injured from a suspicious accident inside the Carlsbad Caverns of New Mexico.

Straddling the border between Montana and Canada lies the Waterton-Glacier International Peace Park-Annarsquo;s home away from home when she is sent on a cross-training assignment to study grizzly bears. Along with bear researcher Joan Rand and a volatile, unpredictable teenage boy, Anna hikes the back country, seeking signs of bear. But the tables are turned on their second night out, when one of the beasts comes looking for them. Daybreak finds...