Almost unimaginably immense, North America stretches from a few degrees short of the North Pole to a few degrees shy of the equator. Archaeologists are now racing to unravel the mysterious past of the forgotten peoples who once inhabited this sprawling land. In Search of Ancient North America explores many of these scientists' most fascinating findings as Heather Pringle chronicles her journeys among the ancient sites of Canada and the United States.

Journeying from the mosquito-infested forests of the far north to the bleak deserts of the American Southwest, Pringle accompanies leading archaeologists and their crews into the field.

At the Bluefish Caves in the northern Yukon, Jacques Cinq-Mars chases down clues to an Ice Age mystery; at the "immense geometric riddle" that is Hopeton Earthworks, Mark Lynott scours the countryside for vestiges of ancient village life; in the thorny wilderness of the Lower Pecos, Solveig Turpin deciphers the enigmatic rock art painted more than 3,000 years ago.

What emerges from Pringle's accounts are surprising portraits of long-lost cultures - the rapacious mariners of southern California who nearly wiped out one of the world's most productive ecosystems; the wealthy nobles of British Columbia who wore salmon-skin shoes and counted their wealth in bottles of salmon oil; the powerful lords of the Mississippi River who won the adoration of their followers with a mysterious medicinal tonic.

Equally intriguing are the controversial new theories that the author presents on a host of subjects, from the origins of art and hallucinogenic drugs to the rise of private property, the identities of the earliest New World migrants, and the astonishing extent of trade in prehistoric North America.