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Anna has joined a bear research team in Glacier Park. They hope to gather enough information to form a picture of its Grizzly bear population.

As Will Burrows continues to search for his lost archaeologist father in the strange underground world he has discovered, he stumbles across a sinister plot with terrible implications for the world

Exhausted by efforts to stop a wildfire that has already devoured 17,000 acres in California, ranger Anna Pigeon takes refuge when the fire crosses her path and emerges with nine other people, only

Anna Pigeon's job as U.S. National Park Service Ranger has lead her to Lake Superior--where an unaccounted-for corpse has turned up among the victims of a 70-year-old shipwreck.

A heart-wrenching yet tender tale of two women whose boundless devotion to each other is continually challenged in nineteenth century America.

When a fellow ranger is injured in a caving accident, Anna Pigeon swallows her paralyzing fear of small spaces and descends into Lechuguilla Cavern to help a friend in need.

While vacationing in Big Bend National Park, roving park ranger Anna Pigeon and her new husband find themselves sucked into a riptide of danger and intrigue that surges from the Mexican desert to t

Anna's new post is temporary supervisory ranger in the obscure Dry Tortugas National Park. It seems to be a tropical paradise, yet all is not innocent on the islands.

Park Ranger Anna Pigeon has been assigned to historic Mt. Locust, an old plantation and inn on Mississippi's Natchez Trace Parkway which is now a tourist spot.

As soon as she hears her older sister is gravely ill, Anna rushes to the Big Apple to sit at her bedside.

Fleeing New York to find refuge as a ranger in remote West Texas, Anna Pigeon stumbles into a web of violence and murder when fellow park ranger Sheila Drury is mysteriously killed.

The roving park ranger and amateur detective Anna Pigeon investigates a case on Isle Royale. Amidst its barren landscape, a group of researchers observe a group of ravenous wolves.

Anna takes on a position as district park ranger of the Mississippi Natchez Trace Parkway. Once there she faces an angry staff.

As fourteen-year-old archaeologist Will and his friends plummet down a subterranean pore, they face deadly creatures and discover a strange fungal shelf, which not only reveals artifacts from ancie

When Will Burrows and his friend Chester embark on a quest to find Will's archaeologist father, who has inexplicably disappeared, they are led to a labyrinthine world underneath London, full of sin