When Yellowstone National Park's grizzly bears and gray wolves suddenly and inexplicably go rogue, archaeologist Chuck Bender teams up 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.

Scott Graham is the author of seven books, including Canyon Sacrifice and Mountain Rampage, books one and two in the National Park Mystery Series from Torrey House Press, and Extreme Kids, winner of the National Outdoor Book Award. Like most visitors to America's first national park, Graham was awestruck by Yellowstone as a child. His fascinatio

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n with the park has continued in the years since, with numerous visits to Yellowstone's geyser and wildlife filled front country and its incomparable wilderness. Graham is an avid outdoorsman and amateur archaeologist who enjoys mountaineering, skiing, hunting, rock climbing, and whitewater rafting with his wife, who is an emergency physician, and their two sons. He lives in Durango, Colorado.