Yellowstone Standoff Torrey House Press

When Yellowstone National Park's grizzly bears and gray wolves suddenly and inexplicably go rogue, archaeologist Chuck Bender teams with his old friend, Yellowstone Chief Ranger Lex Hancock, to defend the suspect members of a group scientific expedition. Soon, Chuck finds himself defending the lives of his family as an unforeseen danger threatens deep in the storied national park's remote wilderness.

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This is the third book of the National Park Mystery series.