activities adventure adventurers autobiography biography biologicalsciences collegesuccess courage english environmentalists explorers family fiction friendship health hiking kidnapping largetypebooks memoir missingchildren missingpersons mountain-climbing mystery mysteryfiction national-parks naturalists nature newyorktimesbestseller non-fiction northcarolina nutrition nyt:hardcover-fiction=2009-05-31 outdoors outdoorskills park-rangers perseverance psychological psychologicalfiction search-and-rescue secrets self-discovery sports survival suspense tragedy twins wilderness yosemite