Charles Mason (1728 -1786) and Jeremiah Dixon (1733-1779) were the British Surveyors best remembered for running the boundary between Pennsylvania and Maryland that we know today as the Mason-Dixon Line. Here is their story as re-imagined by Thomas Pynchon, in an updated eighteenth-century novel featuring Native Americans and frontier folk, ripped bodices, naval warfare, conspiracies erotic and political, major caffeine abuse. We follow the mismatch'd pair - one rollicking, the other depressive; one Gothic, the other pre-Romantic - from their first journey together to the Cape of Good Hope, to pre-Revoluntionary America and back, through the strange yet redemptive turns of fortune in their later lives, on a grand tour of the Enlightenment's dark hemisphere, as they observe and participate in the many opportunities for insanity presented them by the Age of Reason.

Thomas Pynchon is the author of V., The Crying of Lot 49, Gravity's Rainbow, Slow Learner, a collection of short stories, Vineland, and, most recently, Against the Day. He received the National Book Award for Gravity's Rainbow in 1974