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.

A grandmother in her sixties emerges from a mental fog to find she's trapped in her worst nightmare. Rose Dennis wakes up in a hospital gown, her brain in a fog, only to discover that she's been committed to an Alzheimer's Unit in a nursing home. With no memory of how she ended up in this position, Rose is sure that something is very wrong. When she overhears one of the administrators saying about her that she's "not making it through the week," Rose...

Called to the scene of a plane crash on Cumberland Island, a national park off the coast of Georgia, park ranger Anna Pigeon sets out to investigate the cause of the accident and uncovers a sinister plot.

Anna Pigeon, a ranger for the U.S. Park Services, sets off on vacation--an autumn canoe trip in the Iron Range in upstate Minnesota. With Anna is her friend Heath, a paraplegic; Heath's fifteen-year-old daughter, Elizabeth; Leah, a wealthy designer of outdoor equipment; and her daughter, Katie, who is thirteen. For Heath and Leah, this is a shakedown cruise to test a new cutting-edge line of camping equipment. The equipment, designed by Leah, will...

Taking a temporary post as ranger in Dry Tortugas National Park to escape dealing with a marriage proposal, Anna Pigeon investigates a mysterious boating accident that leads her to uncover sinister local crimes from the past

"Just three days after her wedding to Sheriff Paul Davidson, Anna Pigeon moves from Mississippi to Colorado to assume her new post as district ranger at Rocky Mountain National Park, where three girls have disappeared during a religious retreat. Two of the children reappear a month later, clad only in filthy underwear and claiming to remember nothing of the intervening weeks. The girls are frightened and traumatized, but they forge a bond with the...

It is whispered that the Old Ones still haunt Mesa Verde-the restless spirits of the Anasazi, who carved their homes in the mountain's face eight centuries ago ... and then disappeared from the Earth. Newly assigned national parks ranger Anna Pigeon seeks solace from her own personal demons in the ancient cave dwellings of a vanished Native American civilization. But an inexplicable illness affecting visitors to the popular Colorado landmark has dragged...

Anna Pigeon leaves the rugged countryside of Colorado to face the concrete wilds of New York City. Anna is in Manhattan to look after her sister Molly, seriously ill with pneumonia and a kidney infection. Pigeon moves in with a ranger friend who has a place on Ellis Island.

After being caught in a firestorm in Lassen Volcanic National Park, Anna Pigeon, her patient, and the fire fighters survive, except for one who is found in his fire shelter with a knife in his back, and Anna must attend to the physical and emotional needs of the survivors and identify the murderer, while snow delays their rescue.