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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.

Griffin, a newborn bat, thinks he's nothing like his heroic father, until he gets dragged to the Underworld and must find his way home while his father braves the odds to get him back as well.

When a newborn bat named Shade but sometimes called "Runt" becomes separated from his colony during migration, he grows in ways that prepare him for even greater journeys.

Continues the adventures of Shade, a young bat, as he searches for his father and struggles to prevent the evil jungle bat Goth from wiping out the sun.

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.

Dusk, the world's first bat, must lead his colony to safety in a time of changing species.

Matt, a young cabin boy aboard an airship, and Kate, a wealthy young girl traveling with her chaperone, team up to search for the existence of mysterious winged creatures reportedly living hundreds

When his grieving father orders the destruction of the Dark Library, Victor retrieves a book in which he finds the promise of not just communicating with the dead, but entering their realm, and soo

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.