An American frigate and her supporting schooner enter a shoal-filled bay off Northumberland (northeastern England) on a bleak day in December during the American Revolution. Their immediate purpose is to pick up from the rocky cliffs someone referred to at first simply as a pilot. There is a suggestion that he may be a very special pilot when Captain Munson, commander of the frigate, orders his first officer, Lieutenant Edward Griffith, to stand offshore in the ship's barge, filled with marines, while Lieutenant Richard Barnstable, commander of the schooner Ariel, goes ashore in a whaleboat with a handful of men to bring off the stranger.