In frenetic pilgrimages for once-in-a-lifetime rarities that can make or break their lead, the birders race each other from Del Rio, Texas, in search of the rufous-capped warbler, to Gibsons, British Columbia, on a quest for Xantus's hummingbird, to Cape May, New Jersey, seeking the offshore great skua. Bouncing from coast to coast on their potholed road to glory, they brave broiling deserts, roiling oceans, bug-infested swamps, a charge by a disgruntled mountain lion, and some of the lumpiest motel mattresses known to man. The unprecedented year of beat-the-clock adventures ultimately leads one man to a new record, one so gigantic that it is unlikely ever to be bested: finding and identifying an extraordinary 745 different species by official year-end count.