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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

Anna is lodged in Yosemite National Park's historic Ahwahnee Hotel when four employees disappear.

Will Burrows believes he is safe at the very center of the earth, in a world that no one knows exists, but the Styx are close behind and will follow him anywhere, while on the surface, Drake and so

The outer crust is under attack by the subterranean Styx who are turning ordinary humans into walking bombs and incubators for their eggs, and only Will Burrows and his band of retired commandos st