On a spring day in April--sometime in the waning years of the 14th century--29 travelers set out for Canterbury on a pilgrimage to the shrine of Saint Thomas Beckett. Among them is a knight, a monk, a prioress, a plowman, a miller, a merchant, a clerk, and an oft-widowed wife from Bath. Travel is arduous and wearing; to maintain their spirits, this band of pilgrims entertains each other with a series of tall tales that span the spectrum of literary...